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Susceptibility of Larvae of the Black Cutworm to Species of Entomopathogenic Bacteria, Fungi, Protozoa, and Viruses

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Abstract:

About 25% of 63 microorganisms known to be pathogenic to insects (7 of 38 viruses, 5 of 8 bacteria, 2 of 6 fungi, 1 of 11 protozoans) were sufficiently active (induced greater than 30% mortality) against larvae of Agrotis ipsilon (Hufnagel) to warrant additional testing to obtain an estimated LC50. The LC50 for the protozoan, Vairimorpha necatrix (Kramer) was 68 spores/mm2 Nomuraea rileyi (Farlow) Samson and Metarrhizium anisopliae (Metchnikoff) Sorokin, both fungi, had LC50,s of 219 and 807 conidia/mm2, respectively. The LC50 for viruses ranged from 260 inclusion bodies/mm2 for the nucleopolyhedrosis virus (NPV) of Mamestra brassicae (L.) to 7263 inclusion bodies/mm2 for the NPV of Pseudopluisa includens (Walker). The LC50 for 5 preparations of the bacterium Bacillus thuringiensis Berliner ranged from 7.3 to 55.9 ng/mm2

Document Type: Research Article

Publication date: October 1, 1979

More about this publication?
  • 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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