The toxicity of dimethoate to predatory Coleoptera: developing an approach to risk analysis for broad-spectrum pesticides

• Published in: Archives of environmental contamination and toxicology Vol. 28; no. 4; pp. 500 - 507
• Main Authors: JEPSON, P. C, EFE, E, WILES, J. A
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer-Verlag 01.05.1995; Berlin; New York, NY
• Subjects: Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Coleoptera; depredadores; dimethoate; dimetoato; Ecotoxicology, biological effects of pollution; Effects of pollution and side effects of pesticides on protozoa and invertebrates; enemigos naturales; ennemi naturel; ensayo; Fundamental and applied biological sciences. Psychology; insecta; insecte utile; insectos utiles; mortalidad; mortalite; mortality; natural enemies; predateur; predators; testage; testing; toxicidad; toxicite; toxicity; useful insects; Laboratory study; Insecticide; Staphylinidae; Coleoptera; Toxicity; Insecta; Carabidae; Optimization; Coccinellidae; Pest; Arthropoda; Chemical control; Organophosphorus compounds; Predator; Invertebrata; Dimethoate; Non target organism
• ISSN: 0090-4341; 1432-0703
• DOI: 10.1007/BF00211633

The effects of dimethoate on predatory Coleoptera were investigated using topical toxicity bioassays. Six species were evaluated: Tachyporus hypnorum, Coccinella septempunctata, Demetrias atricapillus, Trechus quadristriatus, Bembidion obtusum, and Nebria brevicollis. The LD sub(50) values ranged 3.4 98.8 ng/insect and 1.45 18.20 mu g/g body weight for the species tested. There was a tendency for susceptibility to be negatively associated with body size. Dimethoate was found to be significantly more toxic than deltamethrin on all occasions and at all application rates. The rapidity of accumulation of toxic doses on foliage in the first 2 3 d following application indicated that leaf-borne invertebrates may be affected, even over short foraging bouts.