Abstract
Applications of chlorpyrifos 4E through an overhead center pivot at 1.12 kg (AI)/ha with and without oil (Sunoco UN) in water volumes of approximately 0.83 cm (1984-1985), 2.03 cm (1984), and 4.82 cm (1985) were compared in bioassays using first instar European corn borer, Ostrtnta nubtlalts (Hiibner). Mortality data were obtained from 24 h bioassays done at four 72-h intervals following insecticide application. During both years, neither irrigation rate nor the addition of oil had a significant effect on efficacy or residual activity of chlorpyrifos when averaged over oil versus nonoil treatments and all irrigation rates respectively. Although not statistically significant, applications with 0.83 cm water without oil resulted in highest mortality, and applications with 2.03 cm (1984) and 4.82 cm (1985) of water with oil resulted in the lowest mortality when averaged over all time periods. Quadratic (1984) and linear (1985) responses over time were observed with all four treatments. Average mortality was 33.9 and 19.9% 12 d after application in 1984 and 1985, respectively.
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