Foliage consumption and developmental parameters of the soybean looper and the velvetbean caterpillar (Lepidoptera: Noctuidae) reared on susceptible and resistant soybean genotypes.

Reference Report for IND89005400

Title:	Foliage consumption and developmental parameters of the soybean looper and the velvetbean caterpillar (Lepidoptera: Noctuidae) reared on susceptible and resistant soybean genotypes.
Authors:	Beach, R.M., Todd, J.W.
Source:	J. Econ. Entomol. 1988, 81(1):310-316
Abstract:	Larvae of the soybean looper (SBL), Pseudoplusia includens (Walker), and the velvetbean caterpillar (VBC), Anticarsia gemmatalis Hubner, 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.

Funded by the USDA-ARS. Developed by the USDA-ARS SoyBase and Legume Clade Database group at the Iowa State University, Ames, IA

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