I wrap my trees with corn-stalks to protect from rabbits, and wash them with strong soapsuds, for borers, in May and June.
"The Apple" by Various
An April Soybean Digest article, "BLT Hybrids Eat Weeds' Lunch," reported that Garst Seeds offers hybrids that combine genetic resistance to Lightning and Liberty herbicides, plus Bt protection against European corn borer.
A recent study in Journal Science examines how area-wide suppression of corn borers using Bt corn can improve yield and grain quality even of non-Bt varieties.
2) Southwestern corn borer populations are high, jeopardizing non-Bt hybrids.
In addition, Syngenta plans to petition the EPA for reduced refuges for both corn borer and lepidopteran on a new stack of the Agrisure Viptera trait, the Agrisure CB/LL trait, and Herculex I trait.