Efficacy of an entomogenous bacterium, Bacillus thuringiensis Berliner on sweet potato weevil, Cylas formicarius Fabr.
1992
Amalin, D.M. | Aguda, R.M. | Chujoy, E. (International Potato Center c/o Philippine Council for Agriculture, Forestry and Natural Resources Research and Development, Los Banos, Laguna (Philippines))
A total of 23 strains of Bacillus thuringiensis were isolated from the naturally infected sweet potato weevil (SPW). Characterization of the strains revealed five types of crystal protein such as: Cry IA, Cry IA/Cry IB, Cry IA/Cry ID?, Cry IIIX and SDSCPS. Test on the efficacy of the representative strains was done through dipassay. All of the 6 representative B.t. strains showed certain level of toxicity. Cry IA/Cry IB gave the highest percent mortality followed by Cry IA/Cry IB. Whereas, Cry IA gave the lowest percent mortality. Confirmation on the toxicity or insecticidal activity of the different strains will be done
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