Thursday, May 22 Mummy berry disease and Botrytis blossom blight

May 22nd, 2014 11:42 AM

Hancock and Washington counties

Mummy Berry Disease

There was another infection period overnight for mummy berry disease at all fields with weather stations in Hancock and Washington counties.  Most cups will be dying off by now, but if you have a later or wetter field there is a chance you may have had infection period overnight.  Fungicide applications should protect your plants for about 7 to 10 days after application.   You have until about 3 days from the start of the latest infection to treat your plants to protect them. 

Botrytis Blossom blight
There were also conditions for a moderate to high risk of Botrytis infection around the weather stations at Sedgewick, North Ellsworth and Eastbrook/Waltham over  Tuesday, May 20th  and Wednesday, May 21st nights.   This does NOT mean these fields will get Botrytis blossom blight.  
 I suggest scouting for Botrytis blossom blight in early blooming clones  and dead weeds in those areas to look for the symptoms of the disease.  IF you find the symptoms, then your field may be at risk for Botrytis infection. 

 

Locations Mummy berry Infection  period starting Wednesday May 22nd 
Sedgewick 9:20am
North Ellsworth 11am
Eastbrook/Waltham 6:40pm
Deblois 9pm
Cherryfield 8:40pm
Jonesboro 8:15pm
Wesley  8:40pm
East Machias/Whiting 8pm

Any questions please call Seanna Annis  1-800-897-0757 (Maine only), or email at sannis@maine.edu

Mummy Berry Infection and Botrytis blossom blight Wed. May 21

May 21st, 2014 10:04 AM

Knox, Lincoln and Waldo counties

Botrytis blossom blight

This is the time of year to scout for Botrytis blossom blight on early blooming blueberry clones.  Look at dead open flowers, and any dead or dying tissue (leaves or flowers) you see on weeds near or in your fields.  The symptoms are dead, open, flowers with black hairs sticking out of them. You will probably need a magnifying glass or hand lens to see the hairs. Your flowers may also be killed by mummy berry disease, which will not have the black hairs sticking out of the dead tissue.    If you do have Botrytis in your field and are getting a lot of bloom, this wet weather over the next week may cause infections by this fungus.  It is only worthwhile to apply fungicides for Botrytis blossom blight if you are sure you have this disease in your field.  If you do not have this fungus in your field, no matter how much wet weather you get during bloom you will not get Botrytis disease.  Be careful to protect pollinators if you do have to spray for this disease, spray when pollinators are not in the field.

Mummy Berry Disease

Hancock and Washington counties

There were mature spore producing cups found in a few plots around the barrens on Tuesday.  Most locations the cups were drying up. I expect there are still a few cups around in the barrens and they will be finishing up this week.  If you have a later or wetter field there is a chance you may have had infection periods in the past few days. Infection periods occurred overnight on Mon. May 19th  and Tues. May 20th (please see chart below). Wet weather is expected to continue the end of this week.

Infection periods and fungicide applications

Your fungicide application should protect your plants for about 7 to 10 days.  With heavy rainfall, there may be a bit shorter protection than 10 days.   With the infection periods in the last 2 days, you have until about 3 days from the start of the infection to treat your plants to protect them.

If you would be applying a second application of propiconazole, it would be a good idea to switch to a different fungicide with a different mode of action to help prevent resistance to propiconazole developing in your field (Please see the 2014 fungicide chart).   Other fungicides should be applied as protectants and before infection periods occur.

 

Locations Infection  period starting Monday May 19th  Infection period starting Tuesday, May 20th
Dresden Mills likely none likely none
West Rockport likely none likely none
Appleton likely none likely none
Belfast  likely none likely none
Sedgewick 10am 3:40pm
North Ellsworth continued from Sun. May 18th 1:40pm
Eastbrook/Waltham 5:40pm 6:20pm
Deblois station down station down
Cherryfield 4:40pm 4pm
Jonesboro 3:45pm 7:45pm
Wesley  2:40pm 6:40pm
East Machias/Whiting 4pm 6pm

Mummy berry blight may not be finished yet: Monday May 19th

May 19th, 2014 5:42 PM

Lincoln, Knox, Waldo counties

Only dried up cups were found last week in these areas. There is a chance later fields farther north around Belfast area may still have had infection periods this last weekend.  I expect fields farther south were not affected.

Hancock and Washington counties

Cup that would produce spores were found on Sat. May 17 in Whiting area and numerous spore producing cups were found on Monday May 19th at Pea ridge near Cherryfield.   At other sites, the cups had dried up or were drying up on Friday, May 16th in the mummy berry plots.   I have seen this in other years where the cups are done in mummy berry plots but some mature cups can still be found in the field with some searching.  I expect cups can still found around in the barrens during this last weekend and I expect through the next few days.

Infection periods occurred from Friday May 16th through Monday May 19th (please see chart below) and are expected later this week.

Infection periods and fungicide applications

In those areas where there was an infection period starting Friday May 16th  or the morning of Saturday May 17th, if you have applied fungicide on or after Saturday May 9th your plants were protected  and  you have until the evening of  Tuesday May 20th,  in most areas to apply fungicides to kill any infection. 

If you would be applying a second application of propiconazole, it would be a good idea to switch to a different fungicide with a different mode of action to help prevent resistance to propiconazole developing in your field (Please see the 2014 fungicide chart).   Other fungicides should be applied as protectants and before infection periods occur.

Locations First Infection  period  Second Infection period  Mummy berry plot Mummy berry development
Dresden Mills likely none likely none No n/a
West Rockport likely none likely none Yes dried up cups
Appleton likely none likely none Yes dried up cups
Belfast  Fri. 8:40pm?  Sun. 7:40pm? no n/a
Sedgewick Sat. 10am Sun. 4:20pm no n/a
North Ellsworth Sat 10am Sun. 4:20pm Yes ?
Eastbrook/Waltham Sat. 11am Sun. 3:20pm Yes ?
Deblois station  down station down Yes Mon. cups
Cherryfield Sat. afternoon Sun. 3pm Yes Fri. dying cups
Jonesboro Sat. 12:30pm  continued from Sat. Yes Mon. dead  pinhead
Wesley  Fri. 9:20pm Sun. 12:40pm Yes Fri. dying cups
East Machias/Whiting Fri. 9:20pm  Sat. 12:40pm Yes Sat. cups

Mummy berry infections Wed. May 14 and Thurs. May 15

May 16th, 2014 10:25 AM

Knox, Lincoln, Waldo counties

Growers reported only finding dried up cups on Tuesday May 13th in their mummy berry plots.  I do not think the cups were done at that time in most fields since there is a range of when cups develop and I expect there were lingering cups around.  There were infection periods in some fields over Wednesday night into Thursday, please see the chart below.  I expect most cups will be done by Friday May 16th evening with this warm weather.   I don’t expect most areas to have infection periods occurring this weekend.  If you have a wet, late field you may still experience mummy berry infections this weekend.

Hancock and Washington counties

There were still active cups and some pinheads found in fields in the barrens on Tuesday.   Infection periods did occur in these areas over Thursday night.  I expect the cups will be around this weekend in these areas.   I expect the Blue Hill and  Ellsworth area will also be finishing up with cups this weekend. 

Infection periods and fungicide applications

In those areas where there was an infection period starting Wed. May 14th , if you have applied fungicide on or after Wed. May 7th your plants were protected  and  you have until the evening of  Saturday May 17th,  in most areas to apply fungicides to kill any infection. 

In those areas where there was an infection period starting Thursday May 15th , if you have applied fungicide on or after Thurs. May 8th your plants were protected  and  you have until the evening of  Sunday May 18th,  in most areas to apply fungicides to kill any infection.

If you would be applying a second application of propiconazole, it would be a good idea to switch to a different fungicide with a different mode of action to help prevent resistance to propiconazole developing in your field (Please see the 2014 fungicide chart).   Other fungicides should be applied as protectants and before infection periods occur.

 

Location 2014 Infeciton period start Wed May 14 Infection period start Thurs. May 15 Mummy berry plot Mummy berry development
Dresden Mills  9:40pm borderline 7:40pm No n/a
West Rockport 9pm 7:40pm Yes dried up cups
Appleton 7:40pm  7pm Yes dried up cups
Belfast  about 9pm  none no n/a
Sedgewick station  down (probably had infection period)  9:20pm no n/a
North Ellsworth 10:20pm  9pm Yes ?
Eastbrook/Waltham none 11pm borderline Yes cups
Deblois station  down station down Yes cups
Cherryfield none none Yes cups
Jonesboro none 7:30pm Yes cups/pinhead
Wesley  none 11:20pm borderline Yes cups
East Machias/Whiting none none Yes cups

Mummy berry infections on Mon. and Tues. May 12 and 13

May 14th, 2014 8:26 AM

Knox, Lincoln, and Waldo counties

I think we are getting close to the end of the infection periods in these areas.  There are a few drying up cups being reported but no new ones coming along.  There were infection periods overnight from Monday May 12th to Tuesday May 13th at our Appleton weather station, staring at 6:20pm on Monday May 12 and in Belfast on Mon. May 12th at 9pm.   There were infection periods reported farther south at our weather stations in West Rockport and Dresden Mills.

In those areas where there was an infection period, if you have applied fungicide on or after Monday, May 5th your plants were protected during the infection period over Monday night.  If you have not applied fungicides, you have until the evening of Thursday May 15th, depending upon the rain in your area,  in most areas to apply fungicides (propiconazole or fenbuconazole) to kill any infection.  If you would be applying a second application of propiconazole, it would be a good idea to switch to a different fungicide with a different mode of action to help prevent resistance to propiconazole developing in your field (Please see the 2014 fungicide chart).   Other fungicides should be applied as protectants and before infection periods occur. 

Hancock and Washington counties

There are still cups producing spores in the barrens.  Three of our weather stations reported borderline infection periods, which means the length of leaf wetness reported at the station was 1/2 hour short of what is required for an infection period. Since the length of rain events vary by location, some areas may have experienced an infection period from Sunday night to Monday.  We did not see any infection periods detected at Sedgewick, North Ellsworth, or Eastbrook/Waltham stations.

Location 2014 Infection period start 
Deblois weather station down
Cherryfield Mon. May 12 1am 
Jonesboro Mon. May 12 1am 
Wesley  Mon. May 12 midnight
East Machias/Whiting None

In those areas where there was an infection period, if you have applied fungicide on or after Sunday, May 4th your plants were protected during the infection period over Monday night.  If you have not applied fungicides, you have until the evening of Wednesday May 14th, depending upon the rain in your area,  in most areas to apply fungicides (propiconazole or fenbuconazole) to kill any infection.  If you would be applying a second application of propiconazole, it would be a good idea to switch to a different fungicide with a different mode of action to help prevent resistance to propiconazole developing in your field (Please see the 2014 fungicide chart).   Other fungicides should be applied as protectants and before infection periods occur.

 I apologize for getting this information out so late. If you have any questions, please contact Seanna Annis at sannis@maine.edu.

 

Mummy berry infection periods Sat May 10th

May 10th, 2014 9:43 PM

At all of the weather station conditions for a mummy berry fungus infection period occurred from Friday May 9th or Saturday May 10.  Please see the table below to see the approximate time when the  infection period started in your area.  Most growers in Knox, Lincoln and Waldo counties have plants that are susceptible and there are mummy berry cups producing spores in these areas.   In Hancock and Washington counties, there are mummy berry cups in the fields producing spores but  how far along the blueberry plants have opened vary by field. Growers will need to check their own fields to determine if greater than 40% of flower buds are at F2 and whether they need to spray.

In those areas where there was an infection period, if you have applied fungicide on or after Saturday, May 3rd your plants were protected during the infection period this weekend.  If you have not applied fungicides, you have until the evening of Tuesday May 13th, depending upon the rain in your area,  in most areas to apply fungicides (propiconazole or fenbuconazole) to kill any infection.  Other fungicides should be applied as protectants and before infection periods occur.

Location 2014 Infection period start 
Dresden Mills Sat. May 10 12:40am
West Rockport Sat. May 10 12:40am
Appleton Sat. May 10 1:20am
Belfast  Fri. May 9 6:20pm
Sedgewick Sat. May 10 7am
North Ellsworth Sat. May 10 1:40am
Eastbrook/Waltham Sat. May 10 7am borderline
Deblois weather station down
Cherryfield Sat. May 10 8:20am
Jonesboro Sat. May 10 8:15am 
East Machias/Whiting Fri. May 9 7:40pm and Sat. May 10 8:40am
Wesley  Sat. May 10 8am

Blueberry Weather Stations 2014

May 9th, 2014 12:28 PM
I have 10 weather stations deployed so far.  I have had problems with a few stations and hope to get 4 more either back online and deployed shortly.

The link below takes you to the weather station page with the stations we have out this year. Paste this into your web browser http://www.grovision.com/AgriNET/ComServer/UofMaine/DashboardFrameset.htm

OR click on the link below.

The locations are

Dresden Mills

West Rockport

Appleton

Belfast

Sedgewick

North Ellsworth
Eastbrook/Waltham

Deblois (station down right now)

Columbia

Wesley

East Machias/Whiting

If you have any questions please contact Seanna Annis.

Telephone: 1- 800-897-0757 (Maine only) or  207-581-2621, Email: sannis@maine.edu.

Mummy berry infection period in Appleton and West Rockport

May 7th, 2014 12:46 PM

Lincoln, Knox and Waldo counties

Conditions for a mummy berry infection period occurred at the Appleton  from Monday May 5th through to Tuesday May 6th  and at the West Rockport station from Tuesday at 1:20pm to Wednesday morning.  Infection periods were not seen in Dresden Mills or Belfast weather stations. The temperatures were too cool or the rain too sporadic for an infection period. Mature cups producing spores are found in fields in these counties. 

In those areas where there was an infection period, if you have applied fungicide on or after Tuesday April 29th, your plants were protected during the infection period this weekend.  If you have not applied fungicides, you have until the evening of Thursday May 8th to Friday May 9th, depending upon the rain in your area,  in most areas to apply fungicides, (propiconazole or fenbuconazole) to kill any infection.  Other fungicides should be applied as protectants and before infection periods occur. 

Hancock and Washington counties

No infection periods were produced from Monday through Wednesday afternoon.  Flower bud development was examined at two sites on Tuesday May 7th and found to be 18% of flower buds at F2 in a field near Deblois, and 20% of flower buds at F2 in a field in Township 19.

 

Mummy berry infection period has occurred

May 5th, 2014 10:21 AM

Lincoln, Knox and Waldo counties

There are mature cups producing spores in fields in these counties.  There was an infection period in these counties from the evening of Sat. May 3rd through to Sunday May 4th and some fields may have experienced a second infection period from Sunday May 4th afternoon to overnight. Please see table below for infection period start times.  Most plants in these areas now have enough susceptible tissue to need a fungicide application for protection if you use fungicides.  Most fields have flower buds > 40%  by now.

If you have applied fungicide on or after Saturday April 26th, your plants were protected during the infection period this weekend.  If you have not applied fungicides, you have until the evening of Tuesday May 6th in most areas to apply fungicides, (propiconazole or fenbuconazole) to kill any infection.  Other fungicides should be applied as protectants and before infection periods occur.  

 Hancock and Washington counties

There are mature cups in many fields in these areas.  There were conditions for an infection period, but whether you had one in your field depends upon how far along the plants are.  You will need to check your plants to see whether you need to make a fungicide application.  The best way to do this is to collect a minimum of 10 stems across your field and count all of the flower buds to see how many are at F2.  If there are greater than 40% at F2, you probably have enough susceptible tissue to warrant a fungicide application.

 Please see table below for infection period start times.  Most infection periods started in on Sunday May 4th.  .If you have applied fungicide on or after Sunday April 27th, your plants were protected during the infection period this weekend.  If you have not applied fungicides, you have until the evening of Wednesday May 7th in most areas to apply fungicides, (propiconazole or fenbuconazole) to kill any infection.  Other fungicides should be applied as protectants and before infection periods occur. 

 

 

Location 2014 Infection period start  Mummy Berry plots Column1
Dresden Mills May 3 11:20pm No N/A
West Rockport May 3 7:40pm No cups
Appleton May 3 8:20pm Yes cups

Belfast 

May 3 10pm and May 4 3pm yes N/A

Sedgewick

May 4 1:40am and 6:40pm  Yes N/A
North Ellsworth May 3 11:40pm Yes  
Eastbrook/Waltham May 4 10:20pm borderline No cups
Deblois weather station down Yes cups
Cherryfield weather station down Yes ? 

East Machias/Whiting

May 4 10am  yes cups

Mummy berry season has started

May 2nd, 2014 1:43 PM

Lincoln, Knox, Waldo counties

Cups have been found in West Rockport, Liberty and Appleton this week.  The fungus was likely producing spores in fields in these areas.  We did have long enough leaf wetness for infection IF your plants were far enough along.  Reports vary by the area of whether or not the plants were at 40% of the flower buds at F2 (crown stage).  Please consider your own field development for whether you need to apply fungicides.  I expect with the warm weather today, Friday, and tomorrow, most fields will be at 40% F2 flower buds  or higher on Sunday when the next rain period is expected.

Most infection periods in these areas started late evening on Thursday May 1st (see table below).  For this last infection period, you have until Saturday evening May 3rd to apply fungicides (propiconazole or fenbuconazole) to kill off any infection that occurred in the last infection period.  

If you are using Proline or other fungicides, you may want to apply them BEFORE the next infection period.  Many of these fungicides do not have much kickback activity, so you need to apply them as protectants.   Fungicides containing propiconazole and fenbuconazole, of course, can also be applied as protectants if that is more convenient for timing applications. 

Hancock and Washington counties

Cups have been found in Eastbrook/Waltham, Deblois, the barrens and Wesley.   There was leaf wetness on Thursday night through Friday but most growers report their plants were not ready yet.  Many growers said their fields were closer to F1 than F2 with the cold weather.

I expect with the warm weather today, Friday, and tomorrow, more fields will be at 40% F2 flower buds on Sunday when the next rain period is expected.

 

Location 2014 Start of wetness period MB Plot Fungal Development
Dresden Mills Thurs. 9:20pm No N/A
West Rockport Wed. 9:40pm Yes cups
Appleton Wed. 5:20pm Yes cups
Belfast  Wed. 9:20pm,  Thurs. 9pm  No N/A
Sedgewick Wed 10:20pm No N/A
North Ellsworth Wed. 10:40pm Yes pinhead
Eastbrook/Waltham Wed. 11:20pm yes cup
Deblois

Thurs. midnight,

station down

yes pinheads, cups
Cherryfield Thurs. midnight on Yes pinheads
East Machias/Whiting Wed. 11:40pm Yes unknown

If you have any questions please contact Seanna Annis. Telephone: 1- 800-897-0757 (Maine only) or  207-581-2621, Email: sannis@maine.edu.