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TOXICITY OF BACILLUS THURINGIENSIS VAR. KURSTAKI TO AQUATIC INSECTS

Published online by Cambridge University Press:  31 May 2012

D.C. Eidt
D.C. Eidt
Affiliation:
Maritimes Forest Research Centre, Canadian Forestry Service, PO Box 4000, Fredericton, New Brunswick, Canada E3B 5P7
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Abstract

Representative aquatic insects, larvae of Simuliidae, Chironomidae, Trichoptera, Megaloptera, and nymphs of Ephemeroptera and Plecoptera, were tested for susceptibility to continuous exposure to Bacillus thuringiensis Berliner var. kurstaki at 4.3, 43, and 430 IU/mL. Only Simulium vittatum was affected, and at the highest concentration. Effects on other organisms, particularly Prosimulium fuscum/mixtum, were suggested. The lowest of the concentrations tested was twice the worst-case transitory concentration peaks expected in water from aerial forest spraying at 30 BIU/ha. Spray buffer zones around water bodies are unnecessary at this spray rate.

Résumé

On a mesuré la vulnérabilité d'insectes aquatiques représentatifs, de larves de simuliidés, de chironomidés, de trichoptères, de mégaloptères, et de nymphes d'éphéméroptères et de plécoptères à une exposition ininterrompue à 4,3, à 43 et à 430 U.I./mL de Bacillus thuringiensis Berliner var. kurstaki. Seul Simulium vittatum a souffert, à la concentration la plus élevée. Des effets sur d'autres insectes furent suggérés, en particulier sur Prosimulium fuscum/mixtum. La plus faible des concentrations utilisées était 2 fois supérieure à la pire concentration transitoire prévue dans l'eau suite à un épandage aérien de 30 × 109 U.I./ha. A cette dose, il n'est pas nécessaire de prévoir de zones tampons autour des étendues d'eau.

Type
Articles
Information
The Canadian Entomologist , Volume 117 , Issue 7 , July 1985 , pp. 829 - 837
Copyright
Copyright © Entomological Society of Canada 1985

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