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Effects of Volcanic Ash from the Eruption of Mount St. Helens on the Dissipation of Azinphosmethyl Applied for Codling Moth Control

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The eruption of Mount St.Helens on 18 May 1980 deposited a heavy ash on the orchards in the Yakima Valley, Wash. Tests were conducted to determine if the volcanic ash caused a degradation or dissipation of azinphosmethyl, the principal insecticide used to control Laspeyresia pomonella (L.). It was determined that a chemical reaction between the ash and insecticide that lasted no longer than 2 days resulted in the degradation of ca. 28% of the insecticidal residue. Ash, which absorbed some insecticide, was dislodged in the process of application, particularly the aerial application, where ca. 50% was lost. A rain storm 8 days after the eruption was responsible for the loss of 35% of the insecticidal residue. Overtree sprinkler irrigation alone removed 52% of the insecticidal residue. Consequently, four major factors were affecting the loss of azinphosmethyl: ashrelated chemical degradation; adsorption; and dissipation by rain and imgation. Bioassay showed control was inadequate for larvae when residues were below 0.8 g/cm2, and for adults below 0.6 g/cm2. Residues dropped to ineffective levels within 7 to 14 days.

Document Type: Research Article

Publication date: February 1, 1982

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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.
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