Approach to the evaluation of some factors affecting insect resistance in one 'Acala' and seven sister genotypes of Stoneville cotton in New Mexico

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 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.