Resistance in Vegetative and Reproductive Stages of a Soybean Breeding Line to Three Defoliating Pests (Lepidoptera: Noctuidae)

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Resistance in certain genotypes of soybean, GlYCine max (L.) Merr., has been shown to adversely affect insect behavior and development in laboratory feeding experiments involving excised leaf material. This study investigated effects of resistance in various developmental stages of intact soybean plants on feeding behavior and physiology of com earworm, Helicoverpa zea (Boddie); soybean looper, Pseudoplusia includens Walker; and velvetbean caterpillar, Anticarsia gemmatalis Hiibner. Soybean genotypes 'Cobb' (susceptible) and 'GatIR81-296' (resistant) were grown in the greenhouse and used in choice and no-choice experiments. Choice tests showed the presence of resistance in 'GatlR81-296', and sequential observations of behavior indicated that the insects were inhibited by constitutive factors and components associated with damaged plants. Nochoice tests indicated that resistance occurred in vegetative and reproductive stages of 'GatIR81-296' and resulted in reduced feeding and number of larvae on plants, smaller larvae and pupae, and slower larval development compared with the insects on 'Cobb'. Resistance in 'GatIR81-296' was attenuated in intact reproductive stage plants (R2-R3) compared with vegetative stage (V3-V4)ones.

Document Type: Research Article

Publication date: August 1, 1992

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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