Consumption and Utilization of Three Maize Genotypes by the Southern Armyworm

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Maize varieties with different mechanisms of leaf-feeding resistance to the European corn borer, Ostrinia nubilalis (Hübner), were evaluated for resistance to feeding of the southern armyworm. Spodoptera eridania (Cramer). Armyworm feeding bioassays were conducted with the U.S. inbred, B49, which has high tissue concentrations of DIMBOA [2,4-dihydroxy-7-methoxy(2H)-1,4-benzoxazin (4H) one] and a Caribbean genotype (San Juan × Antigua, with mechanisms of borer leaf-feeding resistance different than the DIMBOA type) in comparison with borer-susceptible DIMBOA-less mutant (bxbx). Metabolic costs of penultimate-instar armyworms fed B49 and SJ exceeded 80% of the assimilated biomass; however, increased consumption rates on these borer-resistant genotypes permitted armyworm growth rates much greater than expected. High consumption rates and a recovery in the subsequent final-instar conversion efficiencies actually resulted in more rapid armyworm growth rates on B49 and SJ maize. Such versatility in feeding and detoxification abilities of this polyphagous species is certainly a major reason for the lack of success in developing armyworm-resistant plants.

Document Type: Research Article

Publication date: April 1, 1982

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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.
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