【摘要】 研究甲氨基阿维菌素苯甲酸盐与茚虫威、毒死蜱混配对稻纵卷叶螟幼虫的生物活性及田间防效。采用浸叶法,测定了混配杀虫剂对稻纵卷叶螟3龄幼虫的毒力,并根据共毒系数评价其增效作用。采用田间茎叶喷雾法,在稻纵卷叶螟1~2龄幼虫发生高峰期开展混配杀虫剂田间药效试验。结果表明:甲氨基阿维菌素苯甲酸盐与茚虫威、毒死蜱分别以质量比1︰4、1︰20混配,对稻纵卷叶螟3龄幼虫具有显著的增效作用,共毒系数(CTC)分别为160.83、221.59。10%甲氨基阿维菌素苯甲酸盐·茚虫威悬浮剂22.5,30 g/hm2和30%甲氨基阿维菌素苯甲酸盐·毒死蜱微乳剂180,270g/hm2处理药后15 d的保叶效果为87.15%~90.81%,杀虫效果为94.98%~96.26%。更多还原

【Abstract】 The toxicity and efficacy of emamectin benzoate and indoxacarb mixture, emamectin benzoate and cholrphoxim mixture against Cnaphalocrocis medinalis were studied. Using leaf-dipping method, the toxicity of the pesticidal mixtures on the 3 rd instar larvae of Cnaphalocrocis medinalis were conducted. And the field control efficacies were also conducted using foliar spray method. The results showed that the co-toxicity efficient(CTC) of the mixture of emamectin benzoate and indoxacarb(mass ratio of 1 ︰ 4) was 160.83. And the CTC of emamectin benzoate and cholrphoxim(mass ratio of 1︰20) was 221.59. The pesticidal mixtures showed synergistic effect on the 3 rd instar larvae.Emamectin benzoate + indoxacarb 10% SC at the active ingredient of 22.5, 30.0 g/hm2, and emamectin benzoate +cholrphoxim 30% ME at the active ingredient of 180, 270 g/hm~2 had good efficacies on Cnaphalocrocis medinalis in rice field. The effects of protecting leaves were 87.15%-90.81%, the control effects were 94.98%-96.26%.更多还原