Authors: Wiseman, B. R.; Widstrom, N. W.

Source: Journal of Economic Entomology, Volume 85, Number 1, February 1992 , pp. 289-292(4)

Publisher: Entomological Society of America

Abstract:

Six recently released dent inbreds of corn, Zea mays L., with resistance to ear damage by corn earworm, Helicoverpa zea (Boddie), larvae were evaluated in the field and laboratory to determine mechanisms ofresistance. 'GT1l7' and 'GT1l8' were tolerant to corn earworm based on ear damage in the field and negligible biological effects on larvae that were fed fresh silks, silk diets, or both, in the laboratory. 'GT1l4' was susceptible to corn earworm in the field but highly antibiotic when larvae were fed silks in the laboratory. Development time to pupation for larvae that were fed silk diets of'GT1l4' was more than twice that required for larvae that were fed check diets. Weight of pupae for larvae fed silk diets of 'GT1l4' was significantly less than for larvae that fed on any of the other entries, including the resistant check 'Zapalote Chico'. 'CT 115' possessed resistance to ear damage in the field as well as antibiosis in the silks in laboratory bioassays. 'GT1l4' will require additional breeding for husk characters to make the antibiotic silks effective against ear damage by larvae of the corn earworm in the field.

Document Type: Research article

Publication date: 1992-02-01

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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