Effect of Chlorpyrifos-Methyl on Oat Ecosystems in Farm Granaries

Authors: WHITE, N. D. G.; SINHA, R. N.

Source: Journal of Economic Entomology, Volume 83, Number 3, June 1990 , pp. 1128-1134(7)

Publisher: Entomological Society of America

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The insecticide chlorpyrifos-methyl was toxic to certain mite species when applied at 3.8 to 7.7 ppm on hulled oats(Avena sativa L.) or 3.1 to 5.0 ppm on hulless oats in a farm granary in southern Manitoba. Insecticide residues decreased by about 65% in hulled oats and 50% in hulless oats in 1 year and by 80% in hulled oats and 60% in hulless oats in 2 years. Bioassay of treated oats with Tribolium castaneum (Herbst) adults for 24 h indicated 100% mortality above 4.7 ppm and negligible mortality below 2 ppm of insecticide. Chlorpyrifos-methyl virtually eliminated the predatory mites Androlaelaps casalis (Berlese) and Blattisocius keegani Fox in treated compared with untreated hulled and hulless oats. Populations of another predatory mite, Cheyletus eruditus (Schrank) were depressed but began to recover when the insecticide decreased below 0.6 ppm on hulled oats. In both types of oats, populations of prey mites Tarsonemus granarius (Lindquist) andAcarus siro L. were unaffected by the insecticide. Other prey mite populations includedAeroglyphus robustus (Banks), which were moderately reduced, andLepidoglyphus destructor (Schrank) andParatriophtydeus coineaui Andre, which were sharply reduced. The insecticide treatment had no effect on seed germination or microfloral infection, although these variables changed during 2 yr. The lack of impact of the insecticide on microflora, seed germination, and several mite species and the rate of insecticide degradation indicated that the original ecosystems could largely reestablish themselves in 2 yr under western Canadian storage conditions, although predator diversity was reduced.

Document Type: Research Article

Publication date: June 1, 1990

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.
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