Abstract
Broadcast spray treatments of eight insecticides were incorporated into Berrien sandy loam soil before planting for control of artificial infestations of the black cutworm, Agrotis ipsilon (Hufnagel), attacking flue-cured tobacco. Rates of application were based on relative toxicities determined by laboratory bioassay.The test insecticides in terms of relative effectiveness were rated as follows: endrin > aldrin = dieldrin = heptachlor > DDT = Dylox > Guthion = Sevin. Increasing the rate of application of each, with the exception of Dylox, Guthion, and Sevin, provided increased protection to the flue-cured tobacco. The treatments in general did not reduce injury to non-economic levels during the first 7 days after the plots were infested. Treatment differences appeared to be more pronounced when the larvae were confined by barriers than when released into open plots. Replacing injured plants with new transplants after each damage count appeared to offer means of assessing speed of action of insecticides against cutworms.
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