Evaluation of the efficacy of 8 types of biocide for controlling grasshoppers in field

Experiments on the efficacy of 8 biocides for controlling grasshoppers were carried on in field, which included 4 types of Metarhisiums，Beauveria，0.3% Azadirachtin，1% Matrine and Sendebao, for screening out several good biocides to popularize in a large scale. The results of this study showed that the effect of 0.3% Azadirachtin，1% Matrine and Sendebao were better than that of other 5 biocides on controlling grasshoppers and their efficiency reached 90% on the 11th day after spraying in field. The effect of 4 types of Metarhisiums reached 65% on the 11th day after spraying and Beauveria was poorer. Metarhisium，Azadirachtin，Matrine and Sendebao can be used as substitutes for organic phosphorus and cycloprothrin pesticide in field due to their goodeffect, lowpoison and stemming from vegetation.