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SYNERGIC EFFECT OF BACILLUS THURINGIENSIS PREPARATION AND DIMETHYPO IN CONTROLLING CNAPHALOCROCIS MEDINALIS[LEP.: PYRALIDAE]

Qian ZhenGuan

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Abstract

Various degrees of synergic effects of Bacillus thuringiensis aqueous concentrate and 25% dimethypo against Cnaphalocrocis medinalis were obtained in a laboratory bioassay when the bio-pesticide was used in mixture with dimethypo at different ratios. Optimal synergistic activity occurred at 3:1 and 1:1 mixture ratios with the toxicity coefficients of 265 and 298, respectively. The toxicity of the mixture at 1:1 ratio was 1.71 times higher than that of dimethypo alone. Applying the mixture at 1:1 ratio in the field plot test gave approximately the same control effect as using dimethypo alone at the same treatment dose.

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What this paper is about

Various degrees of synergic effects of Bacillus thuringiensis aqueous concentrate and 25% dimethypo against Cnaphalocrocis medinalis were obtained in a laboratory bioassay when the bio-pesticide was used in mixture with dimethypo at different ratios. Optimal synergistic activity occurred at 3:1 and 1:1 mixture ratios with the toxicity coefficients of 265 and 298, respectively. The toxicity of the mixture at 1:1 ratio was 1.71 times higher than that of dimethypo alone. Applying the mixture at 1:1 ratio in the field plot test gave approximately the same control effect as using dimethypo alone at the same treatment dose.

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Available abstract

Various degrees of synergic effects of Bacillus thuringiensis aqueous concentrate and 25% dimethypo against Cnaphalocrocis medinalis were obtained in a laboratory bioassay when the bio-pesticide was used in mixture with dimethypo at different ratios. Optimal synergistic activity occurred at 3:1 and 1:1 mixture ratios with the toxicity coefficients of 265 and 298, respectively. The toxicity of the mixture at 1:1 ratio was 1.71 times higher than that of dimethypo alone. Applying the mixture at 1:1 ratio in the field plot test gave approximately the same control effect as using dimethypo alone at the same treatment dose.

Key concepts: Cnaphalocrocis medinalis, Pyralidae, Bacillus thuringiensis, Bioassay, Toxicology, Pesticide, Chemistry, Toxicity

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SYNERGIC EFFECT OF BACILLUS THURINGIENSIS PREPARATION AND DIMETHYPO IN CONTROLLING CNAPHALOCROCIS MEDINALIS[LEP.: PYRALIDAE] — Research Paper | ScholarLens