In the last few days were have been seeing more “Shot Holing” from European Corn Borer (ECB) in fields of Conventional and non Bt hybrids.
ECB larvae will tunnel or bore into the leaf prior to the leaf unfurling, once the leaf unfurls it will show a line of holes or “Shot Holing” in the leaf surface. These holes will disrupt the plants ability to move nutrients and water, as well as increase the potential for more disease issues in the plant. In later stages of plant development, ECB will tunnel or bore into the stalk which will increase the likelihood of stalk lodging during harvest.
One ECB larvae tunneling in a plant prior to tassel can reduce yield 6-8%.