Abstract
The regrowth capabilities of corn seedlings after leaf feeding and three types of Culling injury by natural and artificial infestations of black cutworm larvae at growth (leaf) stages 1 through 4 were determined in a 3-year study. Plants severed at progressively lower levels (above, at, or below the soil surface) and at progressively later stages of development (one- to four-leaf stage) produced significantly fewer ears and less grain than seedlings severed at higher levels and earlier in development. Leaf feeding injury did not significantly reduce ear production or plant yield. Ears produced by plants which sustained cutting injuries generally contained smaller quantities of grain than ears produced by uninjured plants. This information constitutes an important input for the refinement of black cutworm damage thresholds.
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