Abstract
Field studies were conducted in 1984 and 1985 to evaluate the interaction between black cutworm, Agrotis ipsilon (Hufnagel), damage and weed competition on notill corn (Zea mays L.) growth and yields. Corn seedling damage by A. ipsiLon introduced as third instars 5 d before planting was most severe when weeds were removed at the coleoptile stage and larvae were predicted to be fifth to sixth instars. Delaying weed removal until plants had attained the two-leaf stage significantly decreased the percentage of corn plants damaged by A. ipsiLon larvae. A. ipsiLon larvae introduced as second instars or a combination of neonate, second, and third instars 5 d before planting damaged more corn plants when weed removal was performed at two-leaf stage corn and larvae were predicted to be fifth to sixth instars. A significant relationship between the number of corn seedlings cut and weed population occurred for these introduced smaller instars when weed removal occurred at two-leaf stage corn. Delaying weed removal until four-leaf stage corn resulted in significant grain yield reductions from both weed competition and A. ipsiLon damage in 1984 and only from weed competition in 1985.
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