The effect of temperature, larval age, and species of mosquito on the activity of an isolate of Bacillus thuringiensis var. darmstadiensis toxic for mosquito larvae.

Type

Article

Date of Publication

1983

Original Publication

Mosquito News

Volume

43

Series / Issue

Issue: 2

Pages

176-180

Contributed by

American Mosquito Control Association

Notes

Author(s) - Lacey, L. A. and S. L. Oldacre.

 

Abstract

An isolate of Bacillus thuringiensis var. darmstadiensis (H-10) with preferential toxicity for mosquitoes was evaluated in the laboratory against Culex quinquefasciatus, Aedes aegypti, Anopheles albimanus and An. quadrimaculatus; the LC50 values for 2nd instar larvae were 0.41, 3.96, 4.62 and 5.38 viable spores X 104 /ml, respectively. There was a strong positive correlation between temperature and larvicidal activity against fourth instar Cx. quinquefasciatus exposed to 3.46 x 104 viable spores/ml at 18, 24 and 31oC. Second instar Cx. quinquefasciatus and Ae. aegypti were approximately 10 x more susceptible to the spore-crystal suspension than were fourth instar larvae.

Notes

Author(s) - Lacey, L. A. and S. L. Oldacre.