Gypsy Moth: Efficacy of Aerial Treatments of Carbaryl Applied at Half the Normal Dosage Rate

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Airplane spray tests were conducted in New Jersey to determine the efficacy of LV applications of Sevin 4-oil® at a dosage rate of 1 pt Sevin 4-oil (½ lb AI) plus 2 oz kerosene/acre against Porthetria dispar (L.). A variety of sampling methods was used to evaluate effectiveness of the carbaryl application including frass, larval and egg mass counts, as well as net changes in defoliation levels, in both treated and untreated areas. Comparisons in 3 treated blocks with untreated checks, using 1-ft tar paper squares, showed reduction of frass, larvae, and egg masses averaging 83.8, 87.3, and 87.6%, respectively. An additional egg mass count on all trees within 1/40th acre plots showed an average reduction of 93.1% considering all 3 treated blocks. Defoliation levels remained at relatively light, stable levels in the treated areas whereas up to 75% defoliation occurred on host trees in the untreated area.

The test demonstrated that satisfactory gypsy moth population reduction and foliage protection can be obtained using ½-lb dosage rates of carbaryl.

Document Type: Research Article

Publication date: June 1, 1974

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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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