The Bacillus laterosporus strains 921 and 615 were shown to have toxic
ity for larvae of the mosquitoes Aedes aegypti, Anopheles stephensi, a
nd Culex pipiens. The larvicidal activity of B. laterosporus was assoc
iated with spores and crystalline inclusions. Purified B. laterosporus
615 crystals were highly toxic for Aedes aegypti and Anopheles stephe
nsi.