Efficacy of Bacillus sphaericus and Bacillus thuringiensis var. israelensis for control of Culex pipiens and floodwater Aedes larvae in Iowa
Berry, W.J.; Novak, M.G.; Khounlo, S.; Rowley, W.A.; Melchior, G.L.
Journal of the American Mosquito Control Association 3(4): 579-582
1987
ISSN/ISBN: 8756-971X PMID: 3504943 Document Number: 299502
Granular and flowable concentrate formulations of Bacillus thurigiensis var. israelensis provided a 90-100% reduction in Aedes vexans and Culex spp. larvae in natural larval habitats. A briquet formulation of B. thurigiensis was less effective, providing a 12-76% reduction. No residual activity occurred in sites treated with B. thuringiensis. Granular formulations of Bacillus sphaericus (2.78-8.42 kg/ha) caused a 100% reduction in Culex pipiens larvae in natural sites and artificial pools. Bacillus sphaericus also controlled (84-98% reduction) a mixed population of Aedes trivittatus and Cx. pipiens in subplots of a retention pond. In field sties, B. sphaericus continued to control Cx. pipiens larvae for 96 hr.