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Early Silking Corn Needs Protection from European Corn Borer

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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>>

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