Abstract
AbstractMixtures of chlorpyrifos and cypermethrin were tested against 1-day-old larvae of corn earworm, Helicoverpa zea (Boddie), and fall armyworm, Spodoptera frugiperda (J.E. Smith), to determine the type of joint action involved in insect mortality. Statistical analyses indicated that mixtures of both insecticides interacted additively in both species. Chlorpyrifos alone was not as effective against larvae of fall armyworm as it was against larvae of corn earworm. No apparent differences in toxicity between the two species were observed with cypermethrin.
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