02532nas a2200229 4500008004100000245018900041210006900230300001200299490000700311520173700318653001002055653002402065653002702089653002302116653001002139653001302149653001602162100002002178700001902198700001502217856007002232 1987 eng d00aStudies on the Culicine Mosquito Host Range of Bacillus sphaericus and Bacillus thuringiensis var. israelensis with Notes on the Effects of Temperature and Instar on Bacterial Efficacy0 aStudies on the Culicine Mosquito Host Range of Bacillus sphaeric a291-3020 v493 a
Toxicity tests of three strains of Bacillus sphaericus against late instars of 12 culicine mosquito species indicated a wide range of susceptibility. Culex pipiens and C. salinarius were highly susceptible (LC50s < 104 spores/ml) to strain 1593, and C. pipiens and C. restuans were highly susceptible to strain 2013-4. The potency of strain SSII-1 was approximately one-tenth that of strains 1593 and 2013-4 against C. pipiens. Susceptibility of Aedes species to strain 1593 was highly variable. At temperatures ≥ 20°C, A. fitchii, A. intrudens, A. stimulans, and A. vexans were moderately to highly susceptible (LC50s 6 × 103−4 × 104 spores/ml), A. triseriatus was only slightly susceptible (LC50 > 106 spores/ml), and A. aegypti was refractory. Susceptibility of Aedes mosquitoes to strain SSII-1 was less variable, with LC50s against A. aegypti, A. canadensis, A. stimulans, and A. triseriatus all being between 104 and 106 vegetative cells + spores/ml. All species of mosquitoes tested were, in general, highly susceptible to B. thuringiensis var. israelensis (LC50s 2.3 × 103−2.5 × 104 spores/ml). In B. sphaericus toxicity tests, decreased temperatures resulted in up to a 16-fold increase in LC50 and a substantial reduction in probit line slope. First-instar A. aegypti larvae were more susceptible to B. sphaericus strain SSII-1 than the three later instars, which were approximately equally susceptible; however, no significant difference was observed in the susceptibility of the four instars of A. triseriatus.
10aAedes10aBacillus sphaericus10aBacillus thuringiensis10aBiological control10aCulex10aCuliseta10aisraelensis1 aWraight, S., P.1 aMolloy, D., P.1 aSinger, S. uhttp://www.sciencedirect.com/science/article/pii/0022201187900619