Abstract
In whorl-stage field corn, applications of chlorpyrifos 4 emulsifiable concentrate (EC), fenvalerate 2.4EC, and permethrin 3.2EC significantly reduced numbers of first generation European corn borer, Ostrinia nubilalis (Hubner), larvae compared with the untreated check when applied through circular overhead center-pivot irrigation systems with minimal irrigation water (0.58–0.86 cm). Only chlorpyrifos was evaluated all 3 years of the experiment (1982–84). Corn yields were taken in 1983 and all insecticide-treated plots showed significantly greater yields than the untreated check plot. Experiments conducted in 1983 with chlorpyrifos showed satisfactory efficacy when water rate was increased to 2 cm and when insecticide was prediluted to a ratio of 1 part chlorpyrifos/1 part oil/14 parts water to allow use of a high volume injector pump commonly used for fertigation.
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