不同农药混配组合对稻飞虱防治效果的评价

为明确杭州地区防治稻飞虱主要常用农药的确切药效,并筛选出防治稻飞虱的高效混配剂。对12种防治稻飞虱的常用农药进行了混配试验,从37个不同用量及混配组合中筛选出一些优良的混配剂。25%扑虱灵分别与40%异稻瘟净、3.3%天丁乳油、20%好年冬混用后可显著提高对成虫的防效,其中以25%扑虱灵750 g/hm2与20%好年冬750 ml/hm2混用的效果最佳,用药后3,7 d对成虫的防效分别达到95.0%和98.3%。吡虫啉已对褐飞虱产生了严重抗药性,不宜继续在水稻上使用。20%速灭威不同剂量分别与25%扑虱灵、5%锐劲特Regent、40%好劳力混用的7个混配组合对若虫的防效均显著高于其他处理。

Evaluation for control efficiency of different pesticide mixtures against rice plant hoppers

Thirty-seven mixture combinations or concentrations from 12 common pesticides were evaluated in order to determine the control efficiency of these pesticides to rice plant hoppers in the paddy fields of Hangzhou region,Zhejiang,China.Among them,25% buprofezin mixed with 40% iprobenfos or 3.3% abamectin or 20% carbosulfan could increase significantly control efficiency against the nymphs and adults of rice planthoppers,especially the mixture of 25% buprofezin 750 g/hm2 with 20% carbosulfan 750 ml/hm2.The effect of the combination against adults of rice planthoppers was 95%and 98.3%,respectively on 3 and 7days after spraying.Imidacloprid had severely resistance to brown planthopper and could not be used in rice fields.The seven combinations of 20% metolcarb with 25% buprofezin or 5% Fipronil or 40% chlorpyrifos had obvious higher toxicity on the nymphs than that of other treatments.