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Pectinophora gossypiella (Lepidoptera: Gelechiidae): Susceptibility of F1 Larvae from Irradiated Parents to Entomopathogenic Nematodes (Rhabditida: Steinernematidae, Heterorhabditidae)

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We studied the interactions between F1 progeny of Pectinophora gossypiella (Saunders) adults irradiated in the pupal stage and entomopathogenic nematodes. Both sexes of pink bollworm pupae were exposed to 4, 8, 12, or 16 krad substerilizing radiation doses irradiated using a 60Co source. The F1 larvae were tested in a sand bioassay for susceptibility to Steinernema riobravis Cabanillas. Poinar & Raulston, S.carpocapsae (Weiser), and 2 strains of Heterorhabditis bacteriophora (Poinar). The numbers of infecting nematodes were counted after 48 h.1ncreasing parental radiation dost' significantly increased Fl larval susceptibility to S.riobravis and H. bacteriophora, but decreased susceptibility to S. carpocapsae. This difference in susceptibility may be caused by the sedentary nature of larvae from parents receiving higher levels of irradiation, combined with the passive ambush tactics used by S.carpocapsae to acquire an insect host. The need to sustain the F1 population of pink bollworm for sterility promotion and subsequent population collapse suggests S. carpocapsae to be an ideal entomopathogenic nematode to be used in conjunction with inherited sterility control methods.

Document Type: Research Article

Publication date: August 1, 1998

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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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