Spotted Wing Drosophila Update: 7/24/2014

July 24th, 2014 1:27 PM
Male Spotted Wing Drosophila

Male Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

 

SPOTTED WING DROSOPHILA UPDATE: 7/24/2014

Click on photos to enlarge.

David Handley, Vegetable & Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila (SWD) captures continue to be low this week. Single female flies were caught in traps in Buxton, Turner and Thorndike this week. A single male SWD was caught in Turner. We also have reports of flies being caught in New Hampshire, Connecticut and New York, but also in relatively low numbers.

We expect populations to start to build rapidly in the coming weeks as more food (fruit) becomes available for the flies, especially if conditions remain warm and humid. Now is the time to set out traps, if you haven’t already. Start protective sprays on any berries that have begun to ripen once more than one spotted wing drosophila is caught in a trap, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay.

Spotted Wing Drosophila Larvae in Blueberry

Spotted Wing Drosophila Larvae in Blueberry, photo by David Handley

Last year, populations did not reach damaging levels until late August; but weather conditions can alter how quickly the flies will build up. Frequently repeated insecticide sprays (1 to 3 times per week) are often needed to prevent infestations once the insect is present in a field. Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. Research suggests that adding table sugar to group 4A insecticides, such as Assail®, may improve their effectiveness. The recommended rate would be 1-2 lbs. sugar per 100 gallons of spray. Please check product labels for rates, post-harvest intervals and safety precautions. Keeping the fields clean of over-ripe and rotten fruit can also help reduce the incidence of this insect.

There is a good fact sheet series on management of spotted wing drosophila from Penn State Extension at: http://extension.psu.edu/plants/vegetable-fruit/fact-sheets/spotted-wing-drosophila-1.

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                              491 College Avenue
Monmouth, ME 04259           Orono, ME 04473
207.933.2100                            1.800.287.0279

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Sweet Corn IPM Newsletter No. 4 – July 18, 2014

July 18th, 2014 12:53 PM

Sweet CornSweet Corn IPM Newsletter No. 4 – July 18, 2014

Click on photos to enlarge.

CORN EARWORM COUNTS CLIMBING

Pest Pressure Now Moderate for Most Locations

SITUATION
Despite a series of storms coming up from the south, corn pest pressure has remained moderate in most locations this week. Harvest of early corn planted under plastic will likely start next week in southern Maine.

European corn borer:  Moth counts were erratic again this week, with some locations having the highest numbers of the season, while others had none. Silking fields in Dayton, Lewiston, Livermore Falls, Nobleboro and Sabattus were over the threshold of 5 moths per week in silking corn. The Lewiston, Nobleboro and Sabattus sites were also on a spray regime for corn earworm, so no additional spray was recommended. European corn borer feeding damage was over threshold in pre-tassel to tasseling fields in Biddeford, Nobleboro, North Berwick and Sabattus this week.

European Corn Borer Damage on Pre-tassel Stage corn

European Corn Borer Damage on Pre-tassel, photo by David Handley

Corn Earworm Moth

Corn Earworm Moth, photo by David Handley

Corn earworm:  Most locations have now caught at least one corn earworm moth, and counts have risen in a few locations this week. But moth numbers are still relatively low in many fields, given the recent storms moving in from the south. A 6-day spray interval was recommended for corn earworm on silking fields in one Cape Elizabeth location, one Dayton location, Gray, New Gloucester, Nobleboro, North Berwick, Sabattus and one Wells location. A 5-day spray interval was recommended for one Cape Elizabeth site and one Lewiston site. A 4-day spray interval for silking corn was recommended for Wales and Warren.

Fall armyworm:  Moth counts were mostly very low this week. Only one site in Cape Elizabeth exceeded the threshold of 3 moths per week in silking corn. However, this field was also on a spray regime for corn earworm, so no additional sprays should be needed. Feeding damage on plants was noted this week in fields in Biddeford, North Berwick and one Wells site. Although not yet over threshold on it’s own, when combined with European corn borer damage the total feeding exceeded the 15% threshold.

Fall Armyworm Eggs on Corn

Fall Armyworm Eggs on Corn, photo by David Handley

Japanese Beetle

Japanese Beetle, photo by Edwin Remsberg, USDA

Japanese Beetles are becoming plentiful in southern and mid-state areas. These insects often find their way into cornfields and may feed on the silks of developing ears, causing poor tip fill. Sprays for corn earworm (except Bt’s) will often control the Japanese beetle as well.

Squash vine borer moths were caught in pheromone traps in Biddeford, Cape Elizabeth, Dayton, New Gloucester and Wells this week. This week’s counts were some of the highest we’ve seen. The threshold of five moths per week was exceeded in Dayton, New Gloucester and Biddeford.  Vine borers threaten summer squash, winter squash and pumpkins. See the New England Vegetable Management Guide for control options.

Two Squash Vine Borer Moths

Two Squash Vine Borer Moths, photo by Jeffrey Hahn, Univ. of Minnesota Extension

Late Blight on Potato Leaf

Late Blight on Potato Leaf, photo by James Dill

Late Blight Update:  Infections have been confirmed from potatoes in commercial fields and home gardens in southern Maine. With hot, humid weather, this disease can spread rapidly through a region. Growers should scout their potato and tomato fields for symptoms and apply preventative fungicides. For more information visit our Cooperative Extension Publications website and the 2014-2015 New England Vegetable Management Guide.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                              491 College Avenue
Monmouth, ME  04259         Orono, ME  04473
207.933.2100                           1.800.287.0279

 

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Biddeford 0 1 1 18% One spray recommended for ECB + FAW feeding
Cape Elizabeth I 2 3 0 5% 6-day spray interval recommended on all silking corn
Cape Elizabeth II 4 0 10 5-day spray interval recommended on all silking corn
Charleston 0 0 1 No spray recommended
Dayton I 0 7 0 One spray recommended for ECB on silking corn
Dayton II 2 0 1 11% 6-day spray interval recommended on all silking corn
Farmington 1 2 1 2% No spray recommended
Garland 1 0 0 0% No spray recommended
Gray 2 1 0 6-day spray interval recommended on all silking corn
Levant 0 2 0 0% No spray recommended
Lewiston I 6 5 0 5-day spray interval recommended on all silking corn
Lewiston II 1 3 0 0% No spray recommended
Livermore Falls 1 12 0 2% One spray recommended for ECB on silking corn
Monmouth 1 0 0 No spray recommended
New Gloucester 2 0 1 1% 6-day spray interval recommended on all silking corn
Nobleboro 3 5 0 29% 6-day spray interval recommended on all silking corn
No. Berwick 2 0 0 41% 6-day spray interval recommended on all silking corn
Oxford 0 4 0 1% No spray recommended
Palmyra 0 2 0 0% No spray recommended
Sabattus 3 8 0 23% 6-day spray interval recommended on all silking corn
Wales 8 1 0 0% 4-day spray interval recommended on all silking corn
Warren 9 0 1 4-day spray interval recommended on all silking corn
Wells I 0 2 0 8% No spray recommended
Wells II 2 2 1 2% 6-day spray interval recommended on all silking corn

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information.  No endorsement is implied nor is any discrimination intended against other products with similar ingredients.  Always consult product labels for rates, application instructions and safety precautions.  Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

BDN Covers Yarborough’s Blueberry Industry Talk

July 17th, 2014 3:16 PM

The Bangor Daily News reported on a meeting at the University of Maine Cooperative Extension’s Blueberry Hill Farm in Jonesboro. About 150 growers, processors, vendors and suppliers gathered at the wild blueberry research facility to listen to David Yarborough, a blueberry specialist for UMaine Extension, discuss this year’s crop and the latest research projects. “Although we had a late start to the season, we’ve had plenty of rainfall — ample rainfall, really — and wild blueberries like cool and wet conditions,” Yarborough said. “So growing conditions have been fairly optimal.” Yarborough said Maine’s crop usually averages about 90 million pounds, and this season he expects the yield to be in the range of 90–95 million pounds.

Spotted Wing Drosophila Update: 7/17/2014

July 17th, 2014 2:32 PM
Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

SPOTTED WING DROSOPHILA UPDATE:  7/17/2014

Click on photos to enlarge.

David Handley, Vegetable & Small Fruit Specialist; James Dill, Pest Management Specialist; Frank Drummond, Professor of Insect Ecology/Entomology

Spotted wing drosophila captures are becoming more widespread this week, although numbers are still quite low. Single female flies were caught in traps in Cape Elizabeth, Buxton, Turner and Wales this week. We also have reports of flies being caught in New Hampshire, Connecticut and New York, but also in relatively low numbers.

We expect populations to start to build rapidly in the coming weeks as more food (fruit) becomes available for the flies, especially if conditions remain warm and humid. Now is the time to set out traps, if you haven’t already. Start protective sprays on any berries that have begun to ripen once more than one spotted wing drosophila is caught in a trap, or any larvae are noticed in the fruit. Look for fruit flies hovering around fruit and symptoms of premature fruit decay.

Spotted Wing Drosophila on Raspberry

SWD on Raspberry, photo by David Handley.

Last year, populations did not reach damaging levels until late August; but weather conditions can alter how quickly the flies will build up. Frequently repeated insecticide sprays (1 to 3 times per week) are often needed to prevent infestations once the insect is present in a field. Products that provide good control of drosophila on berries include Delegate®, Brigade®, Bifenture®, Danitol®, Mustang Max®, malathion and Assail®. Research suggests that adding table sugar to group 4A insecticides, such as Assail®, may improve their effectiveness. The recommended rate would be 1-2 lbs. sugar per 100 gallons of spray. Please check product labels for rates, post-harvest intervals and safety precautions. Keeping the fields clean of over-ripe and rotten fruit can also help reduce the incidence of this insect.

There is a good fact sheet series on management of spotted wing drosophila on the Penn State Extension Spotted Wing Drosophila website.

David T. Handley
Vegetable and Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                              491 College Avenue
Monmouth, ME  04259          Orono, ME  04473
207.933.2100                            1.800.287.0279

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Strawberry IPM Newsletter No. 6 – July 16, 2014

July 16th, 2014 3:00 PM

Strawberries

Strawberry IPM Newsletter No. 6 – July 16, 2014

Click on photos to enlarge.

RENOVATION AND WEED MANAGEMENT ISSUE

Time to Get Your Strawberry Beds Ready for Next Year

Be Ready to Manage Pests in Day-Neutral Strawberries

A cold, nearly snowless period in late December to early January resulted in some moderate winter injury to many strawberry fields around the state this spring.  But favorable spring growing conditions with little to no frost issues resulted in a pretty good crop in most fields. Weather conditions for the harvest seemed often too hot or rainy, especially during the all-important weekends, but customer demand was strong throughout the relatively short season. Pest pressure in most fields was pretty light throughout the season. Insects, including tarnished plant bug and strawberry bud weevil or clipper appeared fairly late and often in low numbers. While spider mites were hardly an issue, cyclamen mites were present in many fields, causing yellowing and dwarfing of affected plants. Root weevils and white grubs were an issue in some fields, especially where problems had been observed last year. Applications of both soil insecticides and parasitic nematodes appear to have helped reduce the problem in most situations. Disease pressure was also light in most fields. Timely fungicide sprays kept gray mold to a minimum, and foliar diseases, such as powdery mildew and leaf spot only began to show up towards the end of the season.

Don’t forget about your strawberries after harvest. Follow the recommended renovation steps listed below for matted row strawberries as soon after harvest as possible; and continue to scout for and manage disease, insect and weed problems as they arise. Some of the more common issues to be alert for during the summer are listed below.

DISEASES:  Foliar diseases should be monitored in your fields by regularly examining leaves. All of the common leaf diseases were present in fields this spring and we should expect that they will continue to be a problem through the summer. The most common summer diseases are powdery mildew, leaf spot and leaf scorch. Fungicides available for these diseases include captan, Topsin-M®, Cabrio®, and Pristine®. See the New England Small Fruit Management Guide for detailed descriptions of these diseases and their management.

Powdery Mildew

Powdery Mildew, photo by David Handley

Leaf Spot

Leaf Spot, photo by David Handley

Black root rot is a disease complex which can be brought on by a combination of problems, including nematodes, soil fungi (Rhizoctonia, Pythium), herbicide carryover, and soil compaction. Plants become weak and may wilt and die. Roots on affected plants are black and poorly developed. This tends to be a problem in fields that have been in strawberries constantly for many seasons, and in fields that are under stress in other ways, such as winter injury. Rotating fields to crops other than strawberries for at least three years is an important management strategy for black root rot. Improving soil drainage and breaking up hardpans in the soil may also help. Pre-plant root dips with azoxystrobin (Abound®) may also reduce incidence of black root rot in some fields.

INSECTS:  If black vine weevils or strawberry root weevils are a problem in a strawberry field that you would like to carry over, bifenthrin (Brigade®, Bifenture®) can be applied when adult feeding is noticed (usually until mid-late July). Look for notching along the leaf edges and the presence of the black or brown snout beetles. Applications should be made at night when these insects are active, and the highest rate of the insecticide should be used. For control of the grubs a soil drench of Platinum® (thiamethoxam) insecticide should be applied during the fall and/or early spring when the grubs are active in the soil. This product has a 50 day pre-harvest interval and may also be used as a pre-plant or planting treatment for root weevils. Parasitic nematodes such as Heterorhabditis bacteriophora or Steinernema feltiae can also be applied to provide control of root weevil grubs in late August. Nematodes require specialized handling and application. Contact us or talk with one of the suppliers for more details. See the New England Small Fruit Management Guide for sources.

Black Vine Weevil

Black Vine Weevil, photo by David Handley

Strawberry Root Weevil Grub

Strawberry Root Weevil Grub, photo by David Handley

White grubs have been an increasing problem in recent years.  The grubs may be the larvae of several species of scarab beetles, including June beetles, rose chafers, Japanese beetles, Asiatic garden beetles and European chafers. The beetles lay their eggs in June and July and the grubs feed on the roots of strawberries from July through mid September. Affected plants will be stunted and wilted and may die during dry periods. Pulling up plants reveals that roots have been chewed off about an inch below the soil line. Sifting through the soil below the plants may reveal the whitish crescent-shaped grubs which can range in size from 3/8 inch to almost 1 ½ inches long, with six legs near the head and a swollen rear-end. The two most effective periods to treat plantings for grubs are in the spring prior to when they pupate (May) and in the late summer when the next generation is actively feeding (late August). Materials should be applied with plenty of water to moist soil to be sure they reach the root zone. Materials currently registered for control of grubs include Platinum® and Admire Pro®. Parasitic nematodes can also provide control of grubs and should be applied with similar timing. Nematodes are very sensitive to ultraviolet light and dehydration and must be applied with lots of water. See the New England Small Fruit Management Guide for sources of parasitic nematodes.

Strawberry rootworm (not root weevil) is a small (1/8″) dark brown to black beetle which feeds on strawberry foliage, causing it to look skeletonized. The small larvae feed on strawberry roots, further weakening the plant. Adult feeding damage on the leaves usually occurs in late July through August. Heavy rootworm feeding weakens strawberry plants so control is warranted when injury is noticed.

Strawberry Rootworm Beetle

Strawberry Rootworm Beetle, photo by David Handley

Potato Leafhopper

Potato Leafhopper, photo by James Dill

Keep a lookout for potato leafhoppers, which can weaken strawberry plants and spread disease. The potato leafhopper does not overwinter in Maine, but must fly in from southern states. These small, bullet-shaped insects feed on plant sap from the undersides of leaves, causing the leaves to become curled, stunted and yellow-streaked. Symptoms are often first noticed in new strawberry plantings, but leafhoppers will also infest older plantings and a variety of vegetables, flowers and fruit crops. To scout for leafhoppers, brush the leaves of the plants with your hand. The small, whitish adults can be seen flying off the plant. Examine the underside of some injured leaves. Look for small, light green leafhopper nymphs. They are about 1/16 inch long. When touched, they will crawl sideways in a crab-like manner. Controls for potato leafhoppers include malathion, carbaryl or Provado®.

MITESTwo-spotted spider mites can increase significantly during the summer. Continue to take leaf samples for spider mites throughout the summer. If more than 25% of a 60-leaf sample has mites, controls should be applied. Summer is an ideal time to use predatory mites to control pest mites, because they prefer warm temperatures, and there is less chance of an insecticide spray that might kill them. Amblyseius fallacis can provide good control of two-spotted spider mites when they are released at a rate of about 10,000 mites per acre. Predator mite releases should only be made after a spider mite infestation has been found in the field. Releasing predators into a clean field will often result in them dying, due to a lack of food. See the New England Small Fruit Management Guide for sources of predatory mites.

Two-spotted Spider Mites

Two-spotted Spider Mites, photo by David Handley

Cyclamen Mite Damage

Cyclamen Mite Damage, photo by David Handley

Cyclamen mites:  Many fields were infested with these mites this spring, and summer may provide a good opportunity to control them. Plants showing weak growth and yellow, crinkled leaves may be infested with cyclamen mite. These mites are very small and reside down in the crown of the strawberry plant feeding on the developing leaves. They are very hard to see, even with magnification. Miticides such as Thionex®, Kelthane® or Portal® can be effective, but must be applied with lots of water to be sure that the material is carried down into the crowns.

WEEDS:  Weeds can become a big problem during the summer because they are often forgotten among all the other demands on our time and because of limited control options. However, the importance of good weed management should not be underestimated.  Keeping weeds under control this summer will prevent future infestations. Here’s a summary of weed control options for strawberries:

1.  Cultivation:  Following renovation, cultivation between strawberry rows can provide effective temporary control of annual weeds. Several types of cultivators are available which will work well in strawberry beds. Cultivators can also be used to help sweep runners into the plant rows.

2.  DCPA (Dacthal®):  A pre-emergent herbicide used in the early spring, late fall or after renovation. It offers good, short-term control of some annual broadleaf weeds and grasses. It is weak on ragweed, galinsoga, smartweed, shepherd’s purse and mustard. Its action will be improved if worked into the soil by irrigation or light cultivation, and it tends to work best in lighter, warmer soils. This may be used as an alternative to terbacil or napropamide when there is a high risk of plant injury from those products.

3.  Napropamide (Devrinol®):  A pre-emergent herbicide which provides good control of annual grasses, volunteer grains and some broadleaf weeds. It is typically applied just before mulching in the fall. Split applications have become popular due to the loss of other pre-emergent herbicides, e.g. half maximum rate application after renovation or in late summer after desired daughter plants have rooted, and a second half rate application once the strawberry plants are dormant. Napropamide should be activated by irrigation, rainfall or light cultivation within 24 hours of application. Repeated long-term use of this material, i.e. with no crop rotation, may eventually result in poor daughter plant establishment, due to rooting inhibition.

4.  Terbacil (Sinbar®):  An effective pre-emergent herbicide with some post-emergent activity, which should be applied at renovation time – after mowing and tilling the beds, but before new growth begins. A second application can be made in late fall, after the plants are dormant. No more than 6 oz. may be applied in a single application, and no more than 8 oz. may be applied in one season. An example of one season’s use could be 5 oz. applied at renovation and 3 oz. applied in the late fall, the latter in addition to napropamide or DCPA. Terbacil can cause injury to strawberry plants. It is important to determine appropriate rates for each location.

5.  Sethoxydim (Poast®): A post-emergent herbicide for control of actively growing grasses. It will not control broadleaf weeds. It should not be applied when grasses are under stress, e.g. drought, or on unusually hot, humid days. Do not use sethoxydim within 6 weeks of terbacil (Sinbar®) applications, to avoid leaf injury.  Sethoxydim should be used in combination with a crop oil concentrate. Do not tank mix with 2, 4-D.

6.  Clethodim (Arrow®, Prism®, Select®):  A post-emergent herbicide, similar in activity to Poastâ, for control of actively growing grasses. It will not control broadleaf weeds. It should not be applied when grasses are under stress, e.g. drought, or on unusually hot, humid days. Clethodim should be used in combination with a crop oil concentrate.

7.  Paraquat (Gramoxone Inteon®):  A contact herbicide for post-emergent control of most annual weeds and suppression of many perennial weeds. Paraquat will injure or kill strawberries, so applications are made between rows only, with a sprayer shielded to protect the strawberries. It should be used in combination with a nonionic surfactant. Paraquat should not be applied within 21 days of harvest or more than three times in one season.

8.  Pelargonic Acid (Scythe®):  A contact herbicide for post-emergent control of most annual weeds and suppression of many perennial weeds. Scythe® will injure or kill strawberries, so applications are made between rows only, with a sprayer shielded to protect the strawberries. This product has a relatively low toxicity and no residual soil activity. It has a strong, unpleasant odor.

9.  2,4-D Amine (Formula 40®, Amine 4):  A post-emergent herbicide effective on most broadleaf perennial weeds. It will not control grasses, nor offer any pre-emergent control. 2,4-D should be applied immediately after harvest is complete if emerged broadleaf weeds are a problem. After application, the bed should be left undisturbed for three to five days, before mowing the leaves off the plants. This allows time for the material to be taken in by the weeds. This material can also be used when the plants are dormant (late fall or early spring) to control winter annuals and biennials. Fall applications may result in injury to the strawberries if the plants are not completely dormant. Do not tank mix 2,4-D with sethoxydim (Poast®).

10.  Flumloxazin (Chateau®):  A pre-emergent herbicide for control of broadleaf weeds, including dandelion and shepherd’s purse. For use in the fall when plants are dormant for control of weeds the following spring.

11.  Pendimethalin (Prowl H20®):  A pre-emergent herbicide that may be applied as a band with a shielded sprayer between the rows of strawberries. No weed control will be provided within the plant rows, and contact of this product on the strawberry plants will cause injury. May not be applied within 35 days of harvest.

The use of herbicides alone rarely gives complete weed control. Some hand weeding will be necessary. To provide good weed control throughout the life of a strawberry bed, growers should concentrate on crop rotation and good pre-plant weed control.

 

Strawberry Bed Renovation Review

Bed renovation should begin as soon after harvest as possible. The earlier the beds get renovated, the more time runner plants have to develop, which means larger crowns and more flower buds for next year. Early renovation also improves weed management by tilling in many weeds before they go to seed, and can help with insect and foliar disease control by interfering with life cycles at a critical stage of development. The first step in the bed renovation process is to determine which beds should be carried over for another year and which should be plowed down and put into a crop rotation. Beds that did not suffer much from winter injury, had good production and a good plant stand with no major weed, insect or disease problems should be carried over for another year. Beds that do not meet these criteria should be plowed down and seeded to a suitable cover crop to reduce weed, insect and disease problems that have developed, and to increase soil organic matter content. Ideally, beds that are plowed down should be rotated out of strawberries for at least three years. If properly managed, crop rotation will greatly reduce pest problems and improve the vigor and longevity of strawberry beds without the need for soil fumigation.

Renovating a strawberry bed is basically a thinning process to promote healthy new growth that can support a good crop next spring. While some parts of the following renovation scheme may be modified for individual situations, all beds should undergo the following steps once harvest is complete.

1.  Broadleaf weed control:  If perennial broadleaf weeds such as dandelion, shepherd’s purse, daisy or goldenrod are a problem and/or a high population of annual broadleaf weeds such as lambsquarters, sorrel or pigweed are present, hand-pull as many as possible, especially within the plant rows, and/or apply 2,4-D amine (Formula 40®).

Mowing Strawberry Leaves

Mowing Strawberry Leaves, photo by David Handley

2.  Leaf mowing:  Four to five days following the 2,4-D application (or immediately if 2,4-D was not applied) mow off the leaves of the strawberries about 1 ½ inches above the crowns. If the planting is weak, it is recommended that this step of the renovation process be skipped.

3.  Fertilization:  Apply 40 to 60 pounds of actual nitrogen per acre (use the higher rate on sandy soils and fields where growth has been weak). Phosphorus and potassium applications should be made according to soil test recommendations. Soil testing kits and information are available from your county Cooperative Extension office.

4.  Plant thinning:  For the single matted row system, strawberry plant rows should not be any wider than 24 inches. After mowing off the leaves, till the sides of the rows to narrow the beds back to a width of 12 to 18 inches. Use the wider setting for varieties that tend to throw few runners or any fields experiencing drought stress.  Set the tiller so that it incorporates the mowed leaves and spreads about one inch of soil over the remaining crowns at the same time. This will reduce leaf disease and mite problems, and help stimulate new root growth on the remaining plants.

5.  Pre-emergent weed control:  To control annual weeds, apply terbacil (Sinbar® 80WP) according to label directions (2 to 6 oz. per acre). Be sure to follow all label precautions. To avoid plant injury, do not use terbacil if you do not intend to mow off the leaves. Napropamide (Devrinol®) or DCPA (Dacthal®) may be used as an alternative to terbacil at this time, as described below. If you are not using herbicides, regular cultivation, before weeds are more than 2” tall, will be needed throughout the summer.

6.  Subsoiling:  Soil compaction caused by tractor and picker traffic in the field can cause soil drainage problems and interfere with good root development. Using a subsoiling blade between the rows will break up compacted layers of soil and improve water infiltration. Subsoiling is best done late in the renovation sequence to prevent interference from straw and crop residues.

7.  Irrigation:  To encourage rapid plant growth and get the most out of fertilizers and herbicides, irrigate the beds regularly. Strawberries will grow best if they receive 1 ½ inches of water per week during the growing season.

Don’t forget your plants once these renovation steps are completed. Check the strawberry fields regularly during the summer for pest problems. Finding and managing problems early can prevent major problems next spring. Pay close attention to the following items:

Strawberry Irrigation

Strawberry Irrigation, photo by David Handley

Sidedressed Strawberry Planting

Sidedressed Strawberry Planting, photo by David Handley

NUTRITION:  Following the application of 40 to 60 pounds of actual nitrogen at renovation, another 20 pounds of nitrogen should be applied in mid- to late-August to stimulate flower bud development. One way to determine the nutrient status of strawberry plants during the summer is to have a leaf tissue analysis done. Tissue analysis offers a view of what is happening within the plant, and can spot any nutrient deficiencies. In combination with regular soil tests, tissue analysis will provide a complete picture of a field’s fertilizer needs. For more information about tissue analysis contact the UMaine Analytical Lab, 5722 Deering Hall, Rm. 407, University of Maine, Orono, ME 04469-5722, telephone: 207.581.2945.

 

Pest Management for Day-Neutral Strawberries

Most of the important pests that damage June-bearing varieties can be as much or more of a problem on day-neutral types. Because day-neutral strawberries will have buds, flowers and fruit all occurring at the same time, it is critical to pay close attention to the required number of days to harvest after a pesticide application, to be sure you can safely harvest ripe fruit while still protecting buds and blossoms. Some of the more important pests are listed below, along with currently recommended pesticides and days to harvest as stated on current labels.

Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Spotted wing drosophila (Drosophila suzukii) is a new pest, which is likely to be a concern for day- neutral strawberries, fall raspberries and blueberries. This is a small fruit fly, similar to those that hover around the bananas in your kitchen. However, this species will lay its eggs on fruit before it ripens, resulting in fruit that is contaminated with small white maggots just as it is ready to pick. Infested fruit quickly rots and has no shelf life. This insect can complete a generation in under two weeks, with each adult female laying hundreds of eggs. Therefore, millions of flies can be present soon after the introduction of just a few into a field. Frequently repeated insecticide sprays (1 to 2 per week) may be needed to prevent infestations once the insect is present in a field. Spotted winged drosophila can successfully overwinter here, although it may not build up to damaging levels until late in the summer. We have set out monitoring traps for spotted winged drosophila in fruit plantings around the state to determine the activity of this pest in Maine. However, these traps may not provide adequate early warning, i.e. when we find them in a trap they are probably already established in the field. We have found just a few spotted wing drosophila in Maine over the past two weeks, but not yet in damaging numbers. Products that provide good control of drosophila on strawberries include Radiant®, Brigade®, Danitol®, malathion and Assail®. Keeping fields clean of over-ripe and rotten fruit will also help reduce the incidence of this insect. For more information on identifying spotted wing drosophila and updates on populations around the state, visit our SWD blog.  Other spotted wing drosophila resources can be found on the websites of Michigan State University, Penn State, and University of New Hampshire.

Large Tarnished Plant Bug Nymph

Third Instar Tarnished Plant Bug Nymph, photo by David Handley

Tarnished plant bug:  This is one of the most prevalent and persistent pests of day-neutral strawberries, because summer flowering coincides with peak populations of this insect. Adult and nymph stages feed on the flowers and developing fruit, causing them to have seedy ends and other malformations. Regular insecticide applications are often required to keep the damage in check. Scout the flower clusters for adults and nymphs often to determine if controls are necessary. Insecticide products for tarnished plant bug include:

Tarnished Plant Bug
Product Days to Harvest
Brigade® 0
Pyganic® 0
Assail® 1
Dibrom® 1
Rimon® 1
malathion 3
Two-spotted Spider Mites

Two-spotted Spider Mites, photo by David Handley


Two-spotted spider mites:  
Mites can become a problem during the summer when the growing conditions are warm and dry. In addition to infesting the leaves, mites can move onto the fruit, reducing marketability. Plants that are drought-stressed, over fertilized with nitrogen, or prone to dust covering, e.g. growing beside a dirt road, are especially prone to mite infestation. Predatory mites can be an effective means to control spider mites and keep them in check over the season. Releases should only be made when spider mites are present in the field to provide the predators with a source of food. Most of the products labeled for controlling spider mites will also kill predatory mites; so do not use these products after predators have been released. Scout for mites often during the season by examining the undersides of the leaves. Control is warranted if more the 25% of leaves examined have mites.

Two-Spotted Spider Mites
Product Days to Harvest
Brigade® 0
Zeal® 1
Vendex® 1
Acramite® 1
Danitol® 2
Agri-Mek® 2
Oberon® 3
Savey® 3
Kelthane® 3

Potato leafhoppers, sap beetles, thrips and spittlebugs may also become problems on day-neutral strawberries, but are less frequently observed than tarnished plant bug and spider mites. Recommendations for these insects can be found in the current edition of the New England Small Fruit Management Guide.

Gray Mold on Strawberries

Gray Mold on Strawberries, photo by James Dill

Foliar and fruit diseases also need to be managed on day-neutral strawberries, and should be controlled in much the same way as they are for June-bearing varieties. Most of the fungicide products labeled to control gray mold, powdery mildew, leaf spot and leaf scorch have either zero or one day to harvest, so protecting blossoms at the same time as fruit is near harvest should not be a problem; but be sure to check labels carefully and schedule your sprays and harvests accordingly. Anthracnose fruit rot can be especially troublesome for day-neutral strawberries, because it grows well under warm conditions and spreads by splashing water, which is encouraged on plastic mulch. Fungicides registered for control of anthracnose include Cabrio®, Abound®, Pristine® and Switch®, all of which have zero days to harvest restriction.

Important Reminder for Pesticide Users:  Fruit, vegetable or grain growers who use general use (over-the-counter) pesticides and annually sell more than $1,000 of plants or plant products intended for human consumption will be required to have an Agricultural Basic Pesticide Applicator License by April 15, 2015. In the past, only farmers using restricted use pesticides were required to have a pesticide applicators license. The new law extends the licensing requirement to all commercial growers who use pesticides. Training and testing sessions for unlicensed farmers will be held across the state this fall and winter. For more information contact the Pest Management Office at 1.800.287.0279.

Visit the 2014-2015 New England Small Fruit Management Guide online for more detailed pest information.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259         Orono, ME  04473
207.933.2100                           1.800.287.0279

Where brand names are used it is for the reader’s information.  No endorsement is implied nor is any discrimination intended against products with similar ingredients.  Always consult product label for rates, application instructions and safety precautions.  Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the state of Maine and the U.S. Department of Agriculture Cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

A Member of the University of Maine System

 

Handley, Moran Interviewed for MPBN Report on Climate Change, Agriculture

July 14th, 2014 3:21 PM

David Handley, a University of Maine Cooperative Extension specialist of vegetables and small fruits at UMaine’s Highmoor Farm in Monmouth, and Renae Moran, a tree fruit specialist with UMaine Extension, were interviewed for a Maine Public Broadcasting Network report titled “Climate change presents Maine farmers with new challenges.” Handley spoke about testing new crops for the region, such as grapes, as the climate changes. Moran, who is currently testing several varieties of peaches, plums and cherries, warns climate change is unpredictable and more research is needed before any farmer is recommended to make a big investment in traditionally warmer weather fruits.

Sweet Corn IPM Newsletter No. 3 – July 10, 2014

July 10th, 2014 4:07 PM

Sweet Corn

Sweet Corn IPM Newsletter No. 3 – July 10, 2014

Click on photos to enlarge.

FALL ARMYWORM, CORN EARWORM THREATEN SILKING CORN

Late Blight Alert for Potatoes and Tomatoes!

SITUATION
Last weekend’s storm will likely increase insect activity by bringing up moths from the south. Fortunately, the winds were not strong enough to cause widespread lodging in cornfields. More fields are coming into silk as the warm temperatures continue to push growth.  More silking fields are now on a spray regime for corn earworm and/or fall armyworm. The first indication of late blight in Maine was found this week in a potato field in Buxton.

European Corn Borer Larvae on Pre-tassel Stage Corn

European Corn Borer Larvae on Pre-tassel Stage Corn, photo by David Handley

European corn borer:  Moth catches were higher in some locations this week but continue to be erratic. Silking fields in Cape Elizabeth and Sabattus were over the threshold of 5 moths per week in traps, and a spray for silking corn was recommended. European corn borer feeding damage was over threshold in pre-tassel to tasseling fields in Biddeford, Bowdoinham, Lewiston and Sabattus this week. Remember that sprays applied at pre-tassel tend to be more effective than whorl or tassel stage sprays, because the larvae are usually more exposed.

Corn earworm:  The impact of the tropical storm does not yet seem to be showing up in moth counts. Moths were higher in one Cape Elizabeth location and more sights are now catching their first moths, including our more northern sites, but there has not yet been a large bump in trap captures. A 6-day spray interval was recommended for early silking fields in Dayton, New Gloucester and one Lewiston site. A 4-day spray interval was recommended for one silking field in Cape Elizabeth.

Fall armyworm:  Moth counts were up significantly in some locations while others still have yet to catch their first fall armyworm.  Fields in Cape Elizabeth, New Gloucester and Lewiston were over the threshold of 3 moths per week in silking corn. However, these fields were also on a spray regime for corn earworm, so no additional sprays should be needed. The first feeding damage on plants from fall armyworm was noted this week in fields in Biddeford and Lewiston. Although not yet threatening alone, when combined with European corn borer damage the total feeding exceeded the 15% threshold.

Fall Armyworm Moths

Fall Armyworm Moths (female right, male left), photo by James Dill

Two Squash Vine Borer Moths

Two Squash Vine Borer Moths, photo by Jeffrey Hahn, Univ. of Minnesota Extension

Squash vine borer moths were caught in pheromone traps in North Berwick, Biddeford, Dayton and New Gloucester this week. The threshold of five moths per week was exceeded in North Berwick, Wells, Dayton and Biddeford. This pest threatens summer squash, winter squash and pumpkins. Unlike many moths, squash vine borer moths fly during the day. They are black and orange and resemble wasps. The moths lay eggs at the base of squash plants. The larvae bore into the base of the plants, causing vines to wilt and eventually collapse. See the 2014-2015 New England Vegetable Management Guide for control options.

Late Blight on Potato Leaf

Late Blight on Potato Leaf, photo by James Dill

Late Blight Alert! The first symptoms of late blight were found in a potato field in Buxton this week. This devastating disease of tomatoes and potatoes spreads via spores under warm, wet conditions. Growers should take precautions by applying preventative fungicides. See our publications website and the 2014-2015 New England Vegetable Management Guide for management options.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259         Orono, ME  04473
207.933.2100                           1.800.287.0279

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%FeedingDamage Recommendations / Comments
Biddeford 1 3 2 40% One spray recommended for ECB + FAW
Bowdoinham 0 3 0 22% One spray recommended for ECB
Cape Elizabeth I 0 5 0 5% One spray recommended for ECB on silking corn
Cape Elizabeth II 8 3 12 1% 4-day spray interval recommended on all silking corn
Charleston 0 0 0 0% No spray recommended
Dayton I 2 0 0 6-day spray interval recommended on all silking corn
Dayton II 2 0 0 9% 6-day spray interval recommended on all silking corn
Farmington 1 1 1 12% No spray recommended
Garland 1 6 1 0% No spray recommended (no silking corn)
Levant 0 4 1 0% No spray recommended (no silking corn)
Lewiston I 1 1 0 0% No spray recommended
Lewiston II 2 0 3 20% 6-day spray interval recommended on all silking corn
Livermore Falls 1 0 0 3% No spray recommended
New Gloucester 2 4 6 1% 6-day spray interval recommended on all silking corn
No. Berwick 0 0 1 10% No spray recommended
Oxford 0 1 0 5% No spray recommended
Palmyra 0 15 0 1% No spray recommended (no silking corn)
Sabattus 0 29 0 34% One spray recommended for ECB on silking corn
Wales 0 2 0 3% No spray recommended
Warren 0 0 0 13% No spray recommended
Wells I 1 0 0 5% No spray recommended
Wells II 0 0 1 0% No spray recommended

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information.  No endorsement is implied nor is any discrimination intended against other products with similar ingredients.  Always consult product labels for rates, application instructions and safety precautions.  Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Maine State Pomological Society Summer Meeting and Orchard Tour – July 23, 2014

July 7th, 2014 12:42 PM

Apples

Maine State Pomological Society Summer Meeting and Orchard Tour

Please visit the UMaine Cooperative Extension Tree Fruit website for more information on the Maine State Pomological Society Summer Meeting and Orchard Tour, scheduled for Wednesday, July 23, 2014 at a Cooper Farms orchard located in Hartford, Maine.

Sweet Corn IPM Newsletter No. 2 – July 3, 2014

July 3rd, 2014 2:55 PM

Sweet Corn

Sweet Corn IPM Newsletter No. 2 – July 3, 2014

Click on photos to enlarge.

CORN BORER, CORN EARWORM AND FALL ARMYWORM MOTHS ACTIVE

Silking Corn Needs Protection in Early Fields

SITUATION
Cornfields are developing fast with the onset of warm (very warm) temperatures this week. Several early plantings are now in silk while others are coming into tassel. Any showers that arrive this weekend will be welcomed in early fields where conditions are very dry. All of the major corn pests have arrived and are active in cornfields in much of the state. These are especially a threat to early silking fields, which growers often spray lightly, if at all, assuming the major pests are not yet present in damaging numbers.

European corn borer:  Moth catches are spotty around the state this week with about half of the sites now catching moths. A field in Nobleboro was over threshold of 5 moths per week in an early field of silking corn. Another field in Warren was also over the threshold, but does not yet have corn in silk, so no spray was recommended. European corn borer feeding damage was over the 15% threshold in pre-tassel fields in Biddeford, Bowdoinham, New Gloucester, Sabattus, Livermore Falls and Nobleboro.

European Corn Borer Moth

European Corn Borer Moth, photo by David Handley

Corn Earworm Moth

Corn Earworm Moth, photo by David Handley

Corn earworm:  We are now finding corn earworm moths in most of our monitoring sites. Numbers are still low, and most fields do not yet have any silking corn that could be threatened by this pest. When more than one corn earworm moth is found at a site, all silking corn in the fields should be protected with a spray. Additional sprays are based on the average number of moths caught per week or per night (see table below). Only one field in Cape Elizabeth had moths over threshold and early silking corn. A 5-day spray interval was recommended at that location, based on a weekly moth catch of 4.

Male Fall Armyworm Moth

Male Fall Armyworm Moth, photo by David Handley

Fall armyworm:  Moths have arrived in many of the fields monitored this week, indicating that cornfields will soon start showing feeding damage from larvae. Fall armyworm caterpillars leave large ragged holes in the corn leaves and lots of sawdust-like waste within the whorl and developing tassels. We found two fields showing feeding damage this week. In silking fields, fall armyworm larvae may enter the ears through the silk channel, leaving little visible damage to the plant. For that reason, when more than 3 fall armyworm moths are caught in pheromone traps in a week a spray is recommended for all silking corn in a field. Only one field in Cape Elizabeth was over the threshold for silking corn this week. However, that same field was also on a spray schedule for corn earworm in silking corn, so no additional sprays should be required to control fall armyworm.

Japanese beetles should soon be appearing in southern and mid-state areas. These insects often find their way into cornfields and feed on the silks of developing ears, causing poor tip fill. Sprays for corn earworm (except Bt’s) will often control Japanese beetle as well.

Male and Female Spotted Wing Drosophila Flies

Male (left) and Female (right) Spotted Wing Drosophila, photo by Griffin Dill. Actual size: 2-3 mm.

Spotted wing drosophila:  The first capture of a spotted wing drosophila in Maine was reported this week from a wild blueberry field in Blue Hill. These small fruit flies can cause serious fruit losses in raspberries, blueberries and other soft fruits. The flies will only attack fruit that has begun to ripen, and we don’t expect populations to reach damaging levels for a few weeks. For more information visit our website: http://extension.umaine.edu/highmoor/news-events/.

Sincerely,

David T. Handley
Vegetable & Small Fruit Specialist

Highmoor Farm                       Pest Management Office
P.O. Box 179                             491 College Avenue
Monmouth, ME  04259         Orono, ME  04473
207.933.2100                           1.800.287.0279

 

Sweet Corn IPM Weekly Scouting Summary

Location CEW
Moths
ECB
Moths
FAW
Moths
%Feeding
Damage
Recommendations / Comments
Biddeford 0 4 2 25% One spray recommended for ECB on pre-tassel corn
Bowdoinham 2 0 0 28% One spray recommended for ECB on pre-tassel corn
Cape Elizabeth I 1 0 0 0% No spray recommended
Cape Elizabeth II 4 0 15 0% 5-day spray interval recommended on all silking corn
Dayton 0 0 0 0% No spray recommended
Dayton II 1 0 2 2% No spray recommended
Farmington 0 1 0 3% No spray recommended
Lewiston 4 2 1 1% No spray recommended (no silking corn)
Lewiston II 0 4 1 4% (no silking corn)
Livermore Falls 0 0 0 15% One spray recommended for ECB on pre-tassel corn
Monmouth 0 0 0 0% No spray recommended
New Gloucester 1 0 1 1% No spray recommended
Nobleboro 1 10 0 18% One spray recommended for ECB on pre-tassel-silk corn
No. Berwick 1 0 1 40% One spray recommended for ECB on pre-tassel corn
Oxford 1 1 0 4% No spray recommended
Sabattus 1 0 0 38% One spray recommended for ECB on pre-tassel corn
Wales 0 0 0 8% No spray recommended
Warren 0 24 0 0% No spray recommended (no silking corn)
Wells I 0 0 0 0% No spray recommended
Wells II 0 0 1 0% No spray recommended

CEW: Corn earworm (Only fresh silking corn should be sprayed for this insect.)
ECB: European corn borer
FAW: Fall armyworm

Corn Earworm Spray Thresholds for Pheromone Traps

Moths caught per week Moths caught per night Spray interval
0.0 to 1.4 0.0 to 0.2 No spray
1.5 to 3.5 0.3 to 0.5 Spray every 6 days
3.6 to 7.0 0.6 to 1.0 Spray every 5 days
7.1 to 91 1.1 to 13.0 Spray every 4 days
More than 91 More than 13 Spray every 3 days

Thresholds apply only to corn with exposed fresh silk. Lengthen spray intervals by one day if maximum daily temperature is less than 80°F.

European Corn Borer Thresholds
Whorl stage: 30% or more of plants scouted show injury.
Pre-tassel-silk: 15% or more of plants scouted show injury.
Silk: 5 or more moths caught in pheromone traps in one week.

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/

Where brand names or company names are used it is for the reader’s information. No endorsement is implied nor is any discrimination intended against other products with similar ingredients. Always consult product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks.

Published and distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the State of Maine and the U.S. Department of Agriculture cooperating.  Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Fruit Growers Alert 7/3/14: First Male SWD in Maine Wild Blueberry Field Caught this Week!

July 3rd, 2014 1:00 PM

Fruit Growers Alert – July 3, 2014

FIRST MALE SWD IN MAINE WILD BLUEBERRY FIELD CAUGHT THIS WEEK!

We caught our first male spotted wing drosophila (SWD) in a commercial blueberry field in Blue Hill. The traps were put out last week and collected on Monday, June 30, 2014. However, the 15 other fields scouted had no SWD caught. The fruit in the mid-coast wild blueberry fields are just starting to turn blue and thus are susceptible to SWD, and so my recommendation is for all growers to get their traps out as soon as possible.

Frank Drummond
Professor of Insect Ecology/Entomology
University of Maine

IPM Web Pages:
http://extension.umaine.edu/ipm/
http://www.pestwatch.psu.edu/sweet_corn.htm
http://www.umass.edu/umext/ipm/