Mortality of First- Instar Grape Berry Moths (Lepidoptera: Tortricidae) Due to Dosage and Size of Spray Drops Containing Fenpropathrin

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First-instar grape berry moths, Endopiza viteana Clemens, were confined on 3.4 cm2 of grape, Vitis vinifera (L.) cv. Flame Seedless, surface that was treated with various numbers of 120- or 200-µm-diameter spray drops containing 1.4% fenpropathrin 2.4 emulsifiable concentrate. Ninety percent larval mortality was obtained with 34.4 120-µm-diameter drops/cm2 of grape surface (0.125 µg [AI]/cm2). or 14.8 200-µm-diameter drops/em2 (0.250 µg[AI]/cm2). Although more 120-µm drops than 200-µm drops were required to obtain 90% larval mortality, it is possible to reduce the amount of insecticide and water by 50% when the smaller drops are used. Fenpropathrin residues on 1.1 or 1.3% of the treated area were necessary to achieve 90% mortality with the 120- and 200-µm drops, respectively.

Document Type: Research Article

Publication date: August 1, 1989

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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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