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Because of difficulty in determining residues of pyrethrins quantitatively in the presence of high concentrations of the usual synergist, piperonyl butoxide, the evaluation of the residual behavior of the readily analyzed piperonyl butoxide alone has heretofore been thought to be adequate for most residue studies with pyrethrins-piperonyl butoxide mixtures. The residual behavior of the pyrethrins has been thought to parallel that of the piperonyl butoxide component of such mixtures. By the use of chromatographic techniques in conjunction with colorimetric procedures, the residual behavior of the pyrethrins and of piperonyl butoxide on stored wheat have been compared. The pyrethrins have an apparent residue half-life of 5.8 weeks in contrast with that of 9.0 weeks for piperonyl butoxide.
Document Type: Research Article
Publication date: August 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.