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Control of the velvetbean caterpillar anticarsia gemmatalis by nuclear polyhedrosis virus and insecticides and impact of treatments on the natural incidence of the entomo pathogenic fungus nomuraea rileyi



Control of the velvetbean caterpillar anticarsia gemmatalis by nuclear polyhedrosis virus and insecticides and impact of treatments on the natural incidence of the entomo pathogenic fungus nomuraea rileyi



Journal of Economic Entomology 74(4): 480-485



Different concentrations of nuclear polyhedrosis virus (NPV) and insecticides (carbaryl and methomyl) were applied to natural infestations of the velvetbean caterpillar (VBC), A. gemmatalis Huebner, on soybean. Their efficacy in reducing VBC larval populations and their effect on naturally occurring epizootics of the entomogenous fungus N. rileyi (Farlow) Samson were determined. Persistence of the virus in the field was measured. Virus application rates of 75, 145 and 287.5 larval equivalents (LE)/ha suppressed VBC populations below damaging levels. Most virus-induced mortality occurred at 6, 7 and 8 days after spraying. The virus retained 65-70% of its original pathogenicity 7 days after treatment and 25-35% at 10 days. All virus doses reduced the magnitude of a N. rileyi epizootic. Carbaryl or methomyl applied once at 0.28 or 0.07 kg AI[active ingredient]/ha effectively suppressed VBC populations below economic levels for the remainder of the season. High concentrations of insecticides reduced the impact of N. rileyi by reducing the natural substrate, VBC larvae.

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Accession: 005051716

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