European Corn Borer
 European Corn Borer - The European corn borer overwinters as a mature larvae in the stem of the plant
on which if fed in the fall, usually field corn. The larvae ¾ to 1 inch long and
grayish pink in color with a dark head and rows of small brown spots on their
backs. The larvae pupate in late spring and the adults emerge to begin mating
and laying eggs. The eggs are laid in groups of 5 to 50 resembling overlapping
fish scales. They will hatch in approximately 5 days. The young larvae do the
most damage to green bean. They feed on leaves, buds, or flowers for 4-6 days
before boring into stem or the beans when the temperature reaches 70˚F. If the
temperature is higher the larvae will enter the stems and beans more quickly.
There are usually 2-3 generations of European corn borers in Ohio.
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