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Replicated field experiments of certain materials with and without DDT showed that methyl parathion, methyl parathion + DDT, toxaphene + methyl parathion, toxaphene + DDT, and azinphosmethyl + methyl parathion gave good control of the bollowrm, Heliothis zea (Boddie), and the boll weevil, Anthonomus grandis Boheman, when weather was favorable and insecticide applications were made at short intervals. However, when rainfall was excessive and applications could not be applied at short inter\'a]s, methyl parathion, EPN (O-ethyl O-p- nitro-phenyl phenylphosphonothioate), EPN + methyl parathion. and toxaphene + methyl parathion at the rates tested failed to give good control. In 2 experiments in which the differences in yield were statistically significant, formulations containing toxaphene + DDT + methyl parathion and toxaphene + DDT produced the highest yields, indicating that under prevailing weather conditions and bollworm population pressures in the southeast, use of materials with less residual activity will result in poorer control and lower yield.
Document Type: Research Article
Publication date: June 1, 1970
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.