Table 2.

Mosquitocidal activities of spore-crystal mixtures from various B. sphaericus strains against resistant strains of Culux

B. sphaericus strainToxin componentsLC50(ng/ml)a
C. quinquefasciatusGeoRC. pipiens SPHAE
2297Binary toxin>270,000b >400,000b
2297bin::cry11A Binary toxin, Cry11A965 (873–1,066)469 (419–518)
2297pro::cry11Ba Binary toxin, Cry11Ba182 (163–201)120 (134–146)
2297bin::cry11A pro::cry11Ba Binary toxin, Cry11A, Cry11Ba435 (479–527)329 (293–368)
  • a LC50 expressed in nanograms of spore-crystal mixture per milliliter after 48 h. Means are from at least three independent assays. Numbers in parentheses are 95% confidence limits, as determined by Probit analysis.

  • b Less than 50% mortality observed.