title: Efficacy of Bacillus sphaericus and Bacillus thuringiensis var. israelensis for control of Culex pipiens and floodwater Aedes larvae in Iowa.
abstract: Granular and flowable concentrate formulations of Bacillus thuringiensis var. israelensis provided a 90-100% reduction in Aedes vexans and Culex spp. larvae in natural larval habitats. A briquet formulation of B. thuringiensis 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 sites, B. sphaericus continued to control Cx. pipiens larvae for 96 hr.
mesh_terms: D000330:Aedes; D000818:Animals; D001407:Bacillus; D001413:Bacillus thuringiensis; D003465:Culex; D005069:Evaluation Studies as Topic; D007484:Iowa; D007814:Larva; D010572:Pest Control, Biological