Posts Tagged ‘sweet corn’

Sweet Corn IPM Newsletter No. 1 – June 27, 2013

Friday, June 28th, 2013

Sweet Corn

Please visit the Highmoor Farm website for the University of Maine Sweet Corn Integrated Pest Management Newsletter No. 1, June 27, 2013, “2013 Sweet Corn Pest Season Begins!

Any Fresh Silking Corn in Fields Needs Protection: Corn Earworm Still a Threat to Late Corn in Maine

Monday, September 17th, 2012
Corn Earworm

Corn Earworm; photo by David Handley

Hurricane Isaac appears to have only caused a mild bump in pest numbers in Maine corn over the past week, and it is likely that cooler temperatures will slow pest activity in the coming days. Any silking corn remaining requires protection from corn earworm statewide, but fall armyworm and European corn borer are only at problem levels in a few sites. Read more>>

Corn Earworm Pressure Consistently High Across Maine

Thursday, August 23rd, 2012
corn earworm feeding on ear of corn

Corn Earworm Feeding on Corn; photo by David Handley

With continued southerly weather and thunderstorms passing through Maine, insect pressure has remained high, mostly due to corn earworm. At this point, every location is on at least a 4-day spray interval, with some locations on 3-day intervals. For many growers, the youngest corn has reached the silking stage as the corn season begins to come to a close. Warm weather will continue to help corn mature rapidly and insect pressure will likely remain relatively high. Read more>>

Highest Corn Earworm Counts of the Season

Wednesday, August 15th, 2012
Corn Earworm Larvae

Corn Earworm Larvae; photo by David Handley

Warm weather in Maine has pushed corn maturity along rapidly and supplies are picking up. A steady flow of weather from the south, including some heavy showers in some areas, is keeping corn earworm pressure very high in most fields this week. Several locations are now on a recommended 3-day spray interval, which we don’t typically see until early fall when tropical storms start moving through Maine.

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Corn Earworm Puts Most Locations on Spray Schedule

Thursday, August 9th, 2012
European Corn Borer Larvae on Pre-tassel Stage Corn

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

Corn harvest is in full swing across most of Maine after the warm weekend weather. Insect pressure has increased, especially from corn earworm with many locations being placed on 4-day spray intervals. European Corn Borer pressure has remained low with the exception of a few northern locations, and fall armyworm appears to be slightly on the rise, but hasn’t exceeded thresholds anywhere. With the prospect of southerly thunderstorms throughout most of the next week, insect pressure is not expected to decrease.

Read more>>

Corn Earworm Populations Up in Southern Maine

Wednesday, August 1st, 2012

European Corn Borer and Fall Armyworm Threat Remains Small

Corn Earworm Moth

Corn Earworm Moth; photo by David Handley

Corn harvest is still spotty as growers work through the erratic early corn and hope for better uniformity and quality with the main season crop. Many fields received just enough rain to get a break from irrigation this week. A little bit of weather coming up from the southeast coast appears to have bumped up local corn earworm populations, so silking corn is likely to need protection, especially in the southern and coastal areas of the state.

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Early Silking Corn Needs Protection from European Corn Borer

Sunday, July 1st, 2012
European Corn Borer Larvae on Pre-tassel Stage Corn

European Corn Borer larvae on pre-tassel stage corn; photo by David Handley

Moth counts continue to be fairly low this week, although with the advent of silking corn in southern Maine we should pay close attention to these counts. Moths may lay their eggs on the flag leaves of silking corn resulting in larvae entering the ears through the silk channels without leaving any visible signs of feeding on the foliage. Therefore, if 5 or more European corn borer moths are caught in a trap over a week in the presence of silking corn, a spray to protect the silks is recommended. We continue to find feeding injury from small larvae in whorl and pre-tassel stage corn, but only fields scouted in Biddeford and Warren were over the recommended spray threshold. Corn in the whorl stage should be sprayed if fresh feeding injury is found on 30% or more of the plants in a field. At the pre-tassel stage, the control threshold is lowered to 15%. Read more>>

Corn Earworm Arrives in Maine

Tuesday, June 26th, 2012
European Corn Borer Trap

European Corn Borer Trap; photo by David Handley

The recent hot spell has pushed corn growth along rapidly, and brought us our first corn earworm of the season. Many early fields are approaching the pre-tassel stage, and should be getting a side dressing of nitrogen, if needed. Some corn started under plastic in southern Maine is now tasseling and showing some silk. Soil moisture levels remain pretty good in most locations due to the over abundance of rain earlier.

European Corn Borer and Common Armyworm are feeding in Southern Maine. Read more>>