Effect of Bacillus thuringiensis, Anagrapha falcifera Multiple Nucleopolyhedrovirus, and Their Mixture on Three Lepidopteran Corn Ear Pests

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The 1st step in developing microbials as alternatives to chemical insecticides is to determine susceptibility of insects and virulence of the microbials in the laboratory. Anagrapha falcifera multiple nucleopolyhedrovirus (AfMNPV) and 3 Bacillus thuringiensis products, HD-1-S-1980, XenTari, and Javelin, were bioassayed against neonate Ostrinia nubilalis (Hübner), Helicoverpa zea (Boddie), and Spodoptera frugiperda (J. E. Smith) by using a droplet feeding method. The virulence of the B. thuringiensis materials for H. zea and S. frugiperda was Javelin > XenTari > HD-1-S-1980 and for O. nubilalis it was Javelin > XenTari and HD-1-S-1980. AfMNPV was most virulent to H. zea, followed by S. frugiperda, and O. nubilalis. The effect of XenTari and AfMNPV mixtures on the mortality of the 3 corn ear pests also was examined. Mixtures of entomopathogens either had no effect on mortality when compared with both pathogens alone or mortality caused by the virus was reduced with the addition of B. thuringiensis.

Keywords: Helicoverpa zea; Ostrinia nubilalis; Spodoptera frugiperda; modified droplet bioassay method

Document Type: Research Article

Publication date: February 1, 1999

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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