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EFFECTS OF THE INSECT GROWTH REGULATOR BAY SIR 8514 ON PEST DIPTERA AND NONTARGET AQUATIC ORGANISMS

Published online by Cambridge University Press:  31 May 2012

A. E. Colwell  and
C. H. Schaefer
A. E. Colwell
Affiliation:
Lake County Mosquito Abatement District, Lakeport, California 95453
C. H. Schaefer
Affiliation:
Mosquito Control Research Laboratory, University of California, Fresno 93727
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Abstract

Treatment of a pond with a 0.5% sand granule formulation of SIR-8514 yielded a maximum, concentration (4.6 ppb) by 1 day following the application. No residues were detected in the pond sediment and by 28 days posttreatment residues were not found at any depth of the water column. Emergence of pestiferous dipterans was reduced by >99%, and planktonic arthropod populations decreased by >90% following the treatment. Planktonic rotifers and dinoflagellates, and benthic organisms were less severely affected.

Bluegill sunfish (Lepomis macrochirus Rafinesque) and mosquitofish (Gambusia affinis Baird and Girard) accumulated maximum concentrations (ca. 400 ppb) of SIR-8514 by 2 days posttreatment. No residues in fish were detected by 28 days posttreatment, and no fish mortality was observed.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 3 , March 1981 , pp. 185 - 191
Copyright
Copyright © Entomological Society of Canada 1981

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