Timing, Formulation, and Persistence of a Nuclear Polyhedrosis Virus and a Microsporidium for Control of the Velvetbean Caterpillar (Lepidoptera: Noctuidae) in Soybeans

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Nuclear polyhedrosis virus (AgNPV)was tested as a microbial insecticide for Anticarsia gemmatalis Hübner (VBC)in soybeans. A maximum of 66 to 88% infection was achieved in three experiments. Certain of the AgNPV treatments significantly reduced VBC numbers by 7 to 11 days after application. Soybean yields in AgNPV-treated plots were significantly higher than those in control plots in one experiment but not significantly different from carbaryl-treated plots in another experiment. Percentages of infection and yield were similar after application of spray or dust formulations of AgNPV. VBC sampled from AgNPV plots in these experiments still had 18 to 29% infection rates by AgNPV after 1 to 3 years. Overall mean numbers of cadavers with the entomopathogenic fungus Nomuraearileyi (Farlow) Samson were significantly lower in AgNPV-treated plots than in control plots, but greater than in carbaryl-treated plots in one experiment. AgNPV also was sprayed in two additional experiments, initially as VBC populations were beginning to build and later as populations were reaching insecticide threshold levels. Both times of treatment resulted in comparable infection rates and significant decreases in VBC numbers. However, the earlier epizootic resulted in soybean yields significantly greater than those in late-treatment or control plots.

Document Type: Research Article

Publication date: October 1, 1984

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