氟啶虫胺腈对褐飞虱的田间防治效果

目的]明确240g/L氟啶虫胺腈悬浮剂对褐飞虱的田间控制作用及最佳使用剂量。方法]采用田间喷雾法,对氟啶虫胺腈37.5、50、75、100 ga.i./hm2四种不同剂量处理防治褐飞虱效果进行试验研究。结果]240 g/L氟啶虫胺腈悬浮剂37.5、50ga.i./hm2两种剂量处理,药后1~3 d对褐飞虱的防效为51.42%~68.51%,药后7~14 d的防效为61.00%~79.10%,与对照药剂25%噻嗪酮可湿性粉剂112.5ga.i./hm2剂量处理相比,速效性相当,但持效性差;而75、100ga.i./hm2两种剂量处理,药后1~3 d防效为67.18%~74.11%,药后7~14 d防效为81.26%~89.22%,与对照药剂25%噻嗪酮可湿性粉剂112.5ga.i./hm2剂量处理相比,速效性更好,而持效性相当。结论]240 g/L氟啶虫胺腈悬浮剂75~100 ga.i./hm2剂量喷雾处理,能有效控制褐飞虱的发生为害,可供生产上推广应用。

Field Efficacy of Sulfoxaflor 240 g/L SC against Nilaparvata lugens(St(a)l)

The paper aims to conform the efficacy and the optimum dosage of sulfoxaflor 240 g/L SC on controlling Nilaparvata lugens(Stl) in rice field.Methods] Using the method of field spray,the efficacy of sulfoxaflor 240 g/L SC with dosage of 37.5,50,75,100 g a.i./ha on controling N.lugens were determined.Results] The control effects of sulfoxaflor 240 g/L SC with dosage of 37.5 and 50 g a.i./ha after 1-3 days after treatment were 51.42-68.51%,and 61.00-79.10% after 7-14 days,the rapid control effects had no significant difference compared with uprofezin 25% WP at 1125 g a.i./ha,but the uprofezin 25% WP did have more persistent control effects.The control effects at 75 and 100 g a.i./ha after application of 1-3 days were 67.18-74.11%,and 81.26-89.22% after 7-14 days,the persistent control effects had no significant difference with uprofezin 25% WP at 1125 g a.i./ha,but sulfoxaflor 240 g/L SC has more rapid control effects.Conclusions] The dosage of 75-100 g a.i./ha of sulfoxaflor 240 g/L SC could effectively control the populations of N.lugens via method of field spray,it can be applied and extended in rice yield.