Larvae of the soybean looper (SBL), Pseudoplusia includens (Walker), and the velvet bean caterpillar (VBC), Anticarsia gemmatalis Hübner, were restricted to a diet of foliage from either insect-resistant (PI 229358 or GatIR 81-296) or susceptible ('GaSoy 17') soybean genotypes. Decreased growth rate and increased development times were observed for early and late instar SBL developing on the resistant genotypes. Foliage consumption and weight gain measured during the period from the fifth through the ultimate stadium were also significantly reduced. Mortality of SBL larvae was greatest on GatIR 81- 296. Although early growth and development of VBC during early stadia were slowed by the resistant genotypes, consumption, weight gain, and growth rates from the fifth through the ultimate stadium on the resistant genotypes were equal to or greater than those on the susceptible genotype. Larval weights of both SBL and VBC taken after five and eight days of development gave an accurate and time-efficient measurement of resistance. Pupal weights were significantly lower when SBL were reared on resistant genotypes; however, VBC pupal weights were similar on all three genotypes. An increased incidence of supernumerary stadia was noted in larvae of both species restricted to resistant genotypes.
Document Type: Research Article
Publication date: February 1, 1988
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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.