Abstract
Damage by the black cutworm, Agrotis ipsilon (Hufnagel), in relation to corn growth stage and planting date, was studied in commercial cornfields near Rio Bravo, Tamaulipas, Mexico, during the 1990, 1991, and 1992 spring seasons. Fields were sampled during each of the 1- to 7-leaf stages to estimate the percentage of plants damaged by A. ipsilon. Planting dates ranged from 15 January to 15 March. Regardless of planting date, 81% of the attacks by A. ipsilon occurred during the first 3 leaf stages. Fields planted during March sustained the highest damage, in contrast to the January and February plantings, when damage was generally low.
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