Susceptibility of Predaceous Hemipteran Species to Selected Insecticides on Soybean in Louisiana
Authors: BOYD, MICHAEL L.; BOETHEL, DAVID J.
Source: Journal of Economic Entomology, Volume 91, Number 2, April 1998 , pp. 401-409(9)
Publisher: Entomological Society of America
Abstract:Toxicity of selected insecticides to hemipteran predators [i.e., Geocoris punctipes (Say), Nabis capsifonnis Germar, Nabis roseipennis Reuter, and Podisus maculiventris (Say)] was evaluated by contact with foliar residues and indirectly through the consumption of prey [i.e. soybean looper, Pseudoplusia include118 (Walker)] previously exposed to insecticides. Methyl parathion and permethrin generally were more toxic than newer insecticides after predators were exposed to treated foliage. Chlorfenapyr caused contact toxicity equal to permethrin and methyl parathion. Exposure to foliage treated with emamectin benzoate resulted in lower mortality as compared with chlorfenapyr. Foliage treated with Bacillus thuringiensis Berliner subsp. kurstaki had the lowest contact toxicity to hemipteran predators of all insecticides tested. Standard insecticides (i.e., methyl parathion and thiodicarb) caused low indirect toxicity to hemipteran predators after consumption of treated prey. Chlorfenapyr caused significantly greater indirect toxicity than emamectin benzoate, permethrin, and thiodicarb to adult N. roseipennis. Consumption of chlorfenapyr-treated prey also caused significantly greater mortality than imidacloprid, permethrin, spinosad, and thiodicarb to G. punctipes adults. These results demonstrate that most of the newer compounds were more selective than older insecticides. This greater selectivity will enable soybean producers to combat pests but conserve resident beneficial arthropod populations that help restrain pest resurgence and prevent secondary pest outbreaks.
Document Type: Research Article
Publication date: April 1, 1998
- 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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