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Results of a 3-year study to determine the most effective and economical insecticide application schedule for control of cotton insects are presented. Three insecticide mixtures were each applied, and 6 different control schedules were used ranging from full-season insect control to schedules begun at the 25% boll weevil infestation level. The insecticide mixtures used in the experiment were: toxaphene-DDT, endrin-methyl parathion, and azinphosmethyl-DDT. This study indicated that yield losses were caused only by the boll weevil, Anthonomus grandis Boheman; the bollworm, Heliothis zea (Boddie) ; and the tobacco budworm, H. virescens (F.). During the years when both the boll weevil and the bollworm complex caused economic damage, the most satisfactory schedule followed was one where control measures were begun at the 10% boll weevil infestation level and continued only as needed. However, in 1963, when bollworms and tobacco bud worms were the major pests, the highest yields were obtained when the insecticide applications were delayed until boll weevil infestations had reached the 25% level. In 2 of the 3 years, the fullseason schedule resulted in the lowest yields of the 6 application schedules. Results of the 3-year study showed that yields obtained from all application schedules were highly significant when compared with the untreated check; however, there were no significant differencesamong the yields from the application-schedule treatments,
Document Type: Research Article
Publication date: December 1, 1965
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.