Interactions Among Helicoverpa armigera (Lepidoptera: Noctuidae), Its Larval Endoparasitoid Microplitis croceipes (Hymenoptera: Braconidae), and Bacillus thuringiensis


Source: Journal of Economic Entomology, Volume 90, Number 5, October 1997 , pp. 1181-1186(6)

Publisher: Entomological Society of America

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Interactions among Helicoverpa armigera (Hübner), its larval endoparasitoid Microplitis croceipes (Cresson), and Bacillus thuringiensis Berliner were evaluated under laboratory conditions. Prefeeding H. armigera with lethal concentrations (0.08 and 0.16 mg/g) of Dipel (B. thuringiensis subsp. kurstaki strain HD-1) did not prevent M. croceipes from ovipositing in the infected host larvae. Development of parasitoid immatures in host larvae prefed for 24 or 48 h with the dietary B. thuringiensis was not adversely affected. However, feeding on the same diets for 72 h was detrimental to the parasitoid because of premature host mortality. Continuous exposure of H. armigera larvae to the diets at different time intervals after parasitization (0, 4, or 6 d), prevented successful development and pupation of M. croceipes, mainly caused by early mortality of the host. Feeding parasitoid adults with B.thuringiensis preparations of subsp. kurstaki strain HD-73 mixed in honey was not harmful to the wasps. Moreover, 'Dipel or purified B. thuringiensis spores of HD-73, but not purified crystals of this strain, increased longevity of the wasps compared with the control (honey alone). Microscopic observations and color indications showed that the adult parasitoid ingested the honey with the Dipel. The incompatibilities between application of B. thuringiensis to host larvae and parasitization with M. croceipes are discussed with regard to combining microbial and entomophagous control strategies against H. armigera.

Document Type: Research Article

Publication date: October 1, 1997

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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