Effects of Temperature and Instar on the Efficacy of Bacillus thuringiensis var. israelensis and Bacillus sphaericus Strain 1593 Against Aedes stimulans Larvae
|Title||Effects of Temperature and Instar on the Efficacy of Bacillus thuringiensis var. israelensis and Bacillus sphaericus Strain 1593 Against Aedes stimulans Larvae|
|Publication Type||Journal Article|
|Year of Publication||1981|
|Authors||Wraight, SP, Molloy, DP, Jamnback, H, McCoy, P|
|Journal||Journal of Invertebrate Pathology|
|Keywords||Aedes stimulans, Bacillus sphaericus strain 1593, Bacillus thuringiensis var, Biological control, israelensis|
Laboratory trials of Bacillus thuringiensis var. israelensis (serotype 14) and B. sphaericus strain 1593 against field-collected Aedes stimulans showed that susceptibility declined with increasing instar and decreasing temperature. Test results with B. sphaericus were more erratic than with B. thuringiensis, and the efficacy of the former declined more rapidly with decreasing temperature. B. thuringiensis was significantly more active than B. sphaericus under all treatment conditions. These results indicate that the effective use of this strain of B. sphaericus as a mosquito biological control agent may be limited to warm water situations against more susceptible species.