Acephate as a potential management tool of Helicoverpa zea (Lepidoptera: Noctuidae) in snap bean
1993
Russell, W.R. | McLeod, P.J. | Lavy, T.L.
Laboratory bioassays with the corn earworm, Helicoverpa zea (Boddie), were used to determine persistence and movement of foliarly applied acephate in snap beans. Acephate was applied to snap bean foliage at five different vegetative stages (V-1 to V-5) and three reproductive stages (R-1 to R-3). At the recommended field rate of 1.2 kg (AI)/ha, acephate did not translocate to the blooms or pods in concentrations high enough to provide acceptable corn earworm suppression regardless of plant growth stage at application. Increase in acephate rate to two times or four times the recommended field rate failed to increase H. zea mortality. Leaf-disk bioassays indicated that acephate persistence in foliage was long. Under greenhouse conditions H. zea mortality was 72.9% at 14 d. Field studies indicated that single acephate applications, regardless of application timing, were not as effective as the standard compounds used for H. zea suppression. Persistence on foliage, however, may provide acceptable suppression of other insect pests of snap bean.
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