Abstract
Cutworm populations in field corn were sampled from 1979 to 1981 in Missouri, Illinois, and Iowa. The black cutworm (BCW), Agrotis ipsilon (Hufnagel), and the dingy cutworm (DCW), Feltia ducens Walker, were the most abundant species, followed by the claybacked cutworm (CBCW), Agrotis gladaria (Morrison), and the bristly cutworm (BRCW), Lacinipolia renigera (Stephens). Variegated cutworms, Peridromia saucia (Hubner), spotted cutworms, Xestia spp., sandhill cutworms, Euoxa detersa (Walker), and Euoxa spp. were also captured. The relationship between larval cutworm population maturity of DCW, CBCW, BRCW, and BCW and cumulative degree-days from 1 January was quantified. Both BCW and DCW were slightly aggregated in distribution. The coefficient of association for pairs of BCW, DCW, CBCW, and BRCW were all positive, although only DCW and CBCW, and CBCW and BRCW, were significantly associated.
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