2.2%甲氨基阿维菌素苯甲酸盐微乳剂防治水稻二化螟药效试验

【目的】明确甲氨基阿维菌素苯甲酸盐（简称甲维盐）对水稻二化螟的防治效果和持效期,为水稻二化螟防治提供科学依据。【方法】设2.2%甲维盐ME10、20、30ga.i./ha,5%氟虫腈SC30ga.i./ha,20%三唑磷EC400ga.i./ha3种药剂5个处理,以清水处理为对照,在水稻二化螟卵孵高峰期进行喷药处理。于空白对照区水稻受害症状明显或为害定型后调查水稻枯心率（白穗率）、防治效果及保苗效果等;试验期间观察2.2%甲维盐ME对水稻及有益生物有无药害。【结果】2.2%甲维盐ME防治1代二化螟,药后36d保苗效果达90.0%～100.0%,杀虫效果达92.0%～100.0%;防治2代二化螟,药后30d白穗率控制在0.3%～1.2%,受虫害株率控制在0.2%～1.8%,防效可达85.0%～98.7%。试验期间未发现2.2%甲维盐ME对水稻、有益昆虫、水生生物等产生明显不良影响。【结论】2.2%甲维盐ME对水稻二化螟的防效高、持效期长,在水稻二化螟卵孵高峰期,推荐以2.2%甲维盐ME15～30ga.i./ha进行喷雾防治,能有效控制二化螟危害,且环境安全性好。

Control efficacy of 2.2% emamectin benzoate ME against rice stem borer (Chilo suppressalis)

Objective]The objective of the current study was to elucidate the control efficacy of 2.2% emamectin benzoate ME against rice stem borer（Chilo suppressalis）,and the duration of its effectiveness,for effectively controlling the rice stem borer.Method]Rice plants were sprayed with 2.2% emamectin benzoate ME（10,20,30 ga.i./ha）,5% fipronil SC（30 ga.i./ha） and 20% triazophos EC（400 ga.i./ha） at the peak stage of egg hatching in rice stem borer.Spray of water was used as control.The first and second generations of rice stem borer were chosen as the control targets of a new biological pesticide emamectin benzoate 2.2% ME.Rate of dead heart panicle and seedling protection effect of pesticides on rice were investigated on appearance of significant disease symptoms.The phytotoxicity of emamectin benzoate on rice and be-neficial species was also observed.Result]The results showed that the damage of rice stem borer was effectively and persistently controlled by emamectin benzoate 2.2% ME.The seedling protection and insecticidal effect were ranged between 90-100% and 92-100%,respectively,at 36 d after application for controlling the first generation of rice stem borer.In case of second generation of rice stem borer,the rate of white panicle and damaged plant were controlled at 0.3-1.2% and 0.2-1.8%,respectively,with the control efficiency of 85.0-98.0%.Any detrimental effects were not observed on rice,other beneficial insect species or the aquatic organisms,after spraying 2.2% emamectin benzoate ME.Conclusion]2.2% emamectin benzoate ME was found to effectively control the rice stem borers for long duration.Its spray at 15-30 ga.i./ha concentration during the peak incidences of adult borers was recommended for controlling rice stem borer effectively.