The Fate of Methoxychlor Applied by Helicopter for Smaller European Elm Bark Beetle1 Control2
Authors: WALLNER, W. E.; LEELING, N. C.; ZABIK, M. J.
Source: Journal of Economic Entomology, Volume 62, Number 5, October 1969 , pp. 1039-1042(4)
Publisher: Entomological Society of America
Abstract:Methoxychlor residues, applied by helicopter to control Scolytus multislriatus (Marsham) were determined by gas-liguid chromatography from foliage, twig crotches, and soil beneath American elm, Ulmus americana L., trees. Substantial residues were detected in twig crotches and soil beneath trees 1 year after they received mistblower sprays. Four methoxychlor formulations, one at a reduced rate and another containing a drift control chemical, were evaluated. All sprays produced measurable bark residues after 130 days, but xylene-based formulations gave longer-lasting deposits. Decagin added to 12½%sprays confined sprays within a 50-ft swath under winds of 2-4 mph yet did not deter twig-crotch deposition. Sprays applied without Dacagin drifted excessively and failed to maintain adequate swath coverage with a wind of 3 mph. The presence of foliage adversely affected twigcrotch deposits, but foliar residues declined drastically after 130 days. Water samples from a stream adjacent to treated trees indicated that most residues were in the top inch, were diluted by stream flow, and were undetectable after 24 hours. Samples taken at 2-week intervals from spring through fall showed methoxychlor present in 1 part per trillion in water and 1 part per billion in silt.
Document Type: Research Article
Publication date: 1969-10-01
- 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.
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