Efficacy of an entomogenous bacterium, Bacillus thuringiensis Berliner of sweet potato weevil, Cylas formicarius Fabr.
1991
Amalin, D.M. | Aguda, R. | Chujoy, E. (International Potato Center, Southeast Asia and the Pacific Regional Center, P.O. Box 933, Manila (Philippines))
A total of 23 strains of Bacillus thuringiensis Berliner were isolated from naturally infected sweet potato weevils (SPW). Characterization of the strains revealed five types of crystal protein, Cry IA, Cry IA/Cry IB, Cry IA/Cry ID, Cry IIIX, and SDSCPS. Test on the efficacy of six representative strains was done through dipassay. All representative B.t. strains had certain level of toxicity. The strain with Cry IA/Cry IB type of crystal protein had the highest percent mortality followed by that with Cry IA/Cry ID for both larva and adult tests. Whereas, the strain with Cry IA and Cry IIIX had the lowest percent mortality for larva and adult tests, respectively. Verification of the toxicity of the different strains will be done.
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