Two conventional cone-type spray nozzles were compared with three kinds of wide swath, jet-type nozzles for effectiveness in controlling the boll weevil, Anthonomus grandis Boh., and the boll worm, Heliothis zea (Boddie). The wide swath nozzles were capable of spraying 6 to 12 rows per nozzle. Tests were arranged in randomized replicated small plots and were conducted under irrigated and dry-land conditions. Three rates of application per acre were used. Results indicated that the conventional cone-type nozzles produced significantly better control of the boll weevil than the wide swath nozzles. They also were slightly more effective for controlling the boll worm. All treated plots produced significantly higher yields than the untreated check. However, the highest yields were harvested from the plots sprayed with the conventional cone type nozzles. Card data collected for droplet size indicated that the wide swath nozzles produced larger droplets and decreased plant coverage with an increase in distance from the nozzle. Weevil mortality records and yield data indicated that this larger droplet size was mainly responsible for the inferior performance of the wide swath nozzles when compared with the cone nozzles.
Document Type: Research Article
Publication date: October 1, 1959
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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.