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Approach to the Evaluation of Some Factors Affecting Insect Resistance in One 'Acala' and Seven Sister Genotypes of Stoneville Cotton in New Mexico

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Factors affecting insect resistance in one 'Acala' and seven sister genotypes of 'Stoneville' cottons were tested from 1 July to 9 September (1,100–2,400 degree-days) at Las Cruces, N.Mex. from 1978 to 1981. There were 98,509 insect counts made and converted to absolute densities. Within the constraints of the experiment, most of the taxa we studied displayed no significant preference for either small or large plots. The nectariless genotype generally had little effect on the density of the insect populations tested. The frego bract, glandless, and okra leaf genotypes tended to support larger phytophagous populations compared with the 'Stoneville 7A' check. The smooth leaf genotype tended to support smaller Lygus spp. populations and had an ambiguous effect on populations of predators. The highly glanded genotypes had no effect on the phytophagous populations and had an ambiguous effect on populations of predators. An average of 15% of the check insects were primary consumers, 68% were predators, and 17% were parasites, excluding thrips (Frankliniella spp.) and those of minor importance. Lygus spp. made up 81% of the primary consumers. Nabis spp. made up 43%, Orius spp. 23%, and Geocoris spp. 12% of the predators. Proctotrupoidea made up 50%, Chalcidoidea 28%, and Ichneumonoidea 14% of the parasites. Predator-prey ratios varied from smooth leaf (4.60) to frego bract (3.03). Smooth leaf supported the smallest number of insects, 23,553, and okra leaf the largest, 32,650.

Document Type: Research Article

Publication date: June 1, 1984

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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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