Studies on the Enhancement of Bacillus thuringiensis Efficacy Against Heliothis armigera (Lep.:Noctuidae)

doi:10.3321/j.issn:1000-7091.1999.02.014

Abstract

Abstract: The potency of endotoxin preparation of Bt.(Cs3ab-1997) was increased through the addition of either alkaline compounds naturally occurring in the insect midgut, general proteolytic activators or midly toxic compounds of inorganic and organic nature along with endotoxin in the diet. The results showed that the potency of endotoxin preparation of Bt. was increased by 0.95, 1.22, 0.37, 0.45, 1.17, 2.10 and 9.0 times, respectively, after the addition of calcium carbonate, ZnSO₄, magnesium chloride, apple acid, Maleic acid, C₂H₄O₂ and HSCH₂COONa, of which ZnSO₄, C₂H₄O₂ and HSCH₂COONa were more effective at the tested concentrations.

Key words: Bt, Endotoxin potency, Synergist

Yin Xinming, Guo Xianru, Jia Xincheng, Wu Yunhan, Qou Liyou. Studies on the Enhancement of Bacillus thuringiensis Efficacy Against Heliothis armigera (Lep.:Noctuidae)[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1999, 14(2): 67-72. doi: 10.3321/j.issn:1000-7091.1999.02.014.

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