Table 1.

Toxicity of recombinant and Bacillus thuringiensis subsp. israelensis (Bti) 4Q7 strains producing the B. sphaericus (Bs) binary toxin, B. thuringiensis Cry 11B and/or Cyt1A against fourth instar Culex quinquefasciatus and Aedes aegypti in comparsion with wild-type strains

StrainToxin combinationLC50 (fiducial limits) (ng ml−1)Slope (± s.e.m.)
Culex quinquefasciatus
4Q7/pPFT11Bs-CRPCry11B9.2 (6.8-12.1)2.0±0.2
4Q7/p45S1Bin + Cyt1A3.7 (2.5-5.2)1.5±0.2
4Q7/p45S1-11BCry11B + Bin + Cyt1A1.7 (1.2-2.5)1.5±0.2
Bti IPS-82Cry4A + Cry4B + Cry11A + Cyt1A7.9 (6.2-9.7)3.4±0.6
Bs 2362Bin12.6 (8.7-17.5)1.4±0.2
Aedes aegypti
4Q7/pPFT11Bs-CRPCry11B28.5 (17.7-45.2)2.6±0.5
4Q7/p45S1Bin + Cyt1A265.5 (214.9-321.6)3.0±0.4
4Q7/p45S1-11BCry11B + Bin + Cyt1A37.2 (30.5-44.8)3.0±0.4
Bti IPS-82Cry4A + Cry4B + Cry11A + Cyt1A10.2 (8.0-21.9)5.6±1.6
Bs 2362BinNot tested-