Laboratory Toxicity of Pesticides to Geocoris pallens (Hemiptera: Lygaeidae), a Predator in California Cotton
Authors: Yokoyama, Victoria Y.; Pritchard, Jane; Dowell, Robert V.
Source: Journal of Economic Entomology, Volume 77, Number 1, February 1984 , pp. 10-15(6)
Publisher: Entomological Society of America
Abstract:The acute toxicity of 22 pesticides used on cotton was determined on adult Geocoris pallens Stal. Pesticide residues were tested on cotton leaf, paper, and glass surfaces to establish a procedure for evaluating toxicity. Highest mortality was caused by residues on glass; lowest mortality was caused by residues on paper. Tests of residues on leaves are recommended as standard tests to determine pesticide toxicity to G. pallens because leaf residues gave LD50 values that were between the mortality values obtained for the low and highest recommended field rates. The technique was used to identify pesticides with low predator toxicity. Methomyl, methidathion, and carbaryl were less harmful than most chemicals tested; propargite and dicofol were least toxic. Fenvalerate was more toxic than acephate, and acephate was more toxic than methomyl when predators were exposed to these residues on Empoasca sp. The herbicides glyphosate and DSMA and the defoliants DEF and mer ph os had low acute toxicity. High mortalities caused by the herbicides dalapon and MSMA and the defoliant paraquat dichloride suggested that, to spare seasonal and overwintering predator populations, other chemicals should be used. The fungicides sulfur and benomyl were almost nontoxic at recommended dose rates, but the soil fumigant metham sodium caused moderate mortality. Pesticides least toxic to G. pallens are recommended for use in cotton pest management.
Document Type: Research Article
Publication date: February 1, 1984
- 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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