Cotton cultivars with Heliothis spp.-resistant characters (glabrous, nectariless, and high gossypol) were grown under Rolling Plains conditions of limited irrigation and low nitrogen inputs. To assess resistance, data were taken on oviposition rate, numbers of larvae, and damage to squares and soft bolls. In the initial screening studies conducted from 1976 to 1978, larval numbers and damage to squares were lower in the resistant cultivars 'HG-BR-8-N,' 'HG-6-1-N,' 'La 17801,' and 'HG-P-9-13' than in the nonresistant cultivar 'Lankart Sel. 611.' However, yields were generally the same in all cultivars. These results prompted irrigation management studies in 1979 and 1980. When multiple irrigations were not managed to avoid Heliothis zea (Boddie) oviposition peaks, resistant cultivars did suppress damage in relation to nonresistant cultivars. However, when cotton was grown dryland, or when irrigations were managed to avoid oviposition peaks, damage to squares and soft bolls sustained by resistant and nonresistant cultivars was the same. The resistant cultivars rarely produced higher yields than the nonresistant cultivars in any of the irrigation management schemes.
Document Type: Research Article
Publication date: August 1, 1983
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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.