Toxicity of Chlorpyrifos to Normal and Defaunated Formosan Subterranean Termites

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The toxicity of chlorpyrifos to normal and defaunated Coptotermes formasanus Shiraki was determined. The LD50 values (based on the 5th day mortality) ranged 2.22–3.18 µg/g termite over a period of 2 yr. Defaunated termites, relative to norma1 ones, appeared to be more susceptible to chlorpyrifos. Symptoms of poisoning were typically cholinomimetic. The feeding activity of the termites was affected by chlorpyryfos with the degree of feeding being inversely related to the dosage of the insecticide applied. Mortality attributable to the acute action of chlorpyrifos was apparently over by 5 days posttreatment. Subsequent high mortality of the treated normal termites could be due to depletion of the protozoon content in the hindgut which caused host starvation.

Document Type: Research Article

Publication date: April 1, 1979

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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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