三氟苯嘧啶对稻飞虱的控制效果与应用技术研究

Control Effect and Application Technology of Triflumezopyrim SC on Rice Planthoppers

明确10%三氟苯嘧啶悬浮剂对水稻主要害虫稻飞虱(白背飞虱与褐飞虱)的防治效果及对田间主要天敌蜘蛛的影响,为其推广应用提供科学依据。设10%三氟苯嘧啶悬浮剂75 mL/hm^2(低剂量)、150mL/hm^2(中剂量)和225 mL/hm^2(高剂量)3个剂量处理,设25%吡蚜酮悬浮剂300 mL/hm^2和25%噻虫嗪水分散粒剂90 g/hm^2为对照药剂处理,以清水处理为空白对照,每处理3次重复,于稻飞虱若虫盛期喷雾施药。结果表明:与对照药剂相比,10%三氟苯嘧啶悬浮剂对稻飞虱的杀虫活性最高。田间调查结果显示,10%三氟苯嘧啶悬浮剂低、中、高剂量处理药后14天对白背飞虱的平均防治效果分别为95.16%、96.78%和100.00%;对褐飞虱药后14天的平均防治效果分别为90.29%、96.07%和93.81%。高剂量试验药剂对稻田蜘蛛有一定影响,药后21～35天田间蜘蛛总数有所下降;中、低剂量试验药剂对田间蜘蛛影响较弱,至药后35天蜘蛛总数才微弱下降,对蜘蛛的安全性要优于对照药剂吡蚜酮及噻虫嗪。综上,10%三氟苯嘧啶悬浮剂对稻飞虱具有良好的防治效果,并表现出较长的持效期,对天敌蜘蛛的影响较小,可在水稻生产上推广应用。

The paper aims to elucidate the control effect of 10%triflumezopyrim suspension on rice planthoppers(including the white-backed planthopper,WBPH and brown planthopper,BPH),which are the main pests on rice,and the influence on spiders,the predator of planthoppers,and to provide references for the promotion and application of 10%triflumezopyrim suspension.Three treatments are set as 75 mL/hm^2(low dose),150 mL/hm^2(medium dose)and 225 mL/hm^2(high dose),and 25%pymetrozine suspension 300 mL/hm^2 and 25%thiamethoxam water dispersible granule 90 g/hm^2 are used as positive control group,and water as blank control group.Each treatment repeated three times,and the drugs are sprayed during the outbreak of rice planthopper nymph.The results showed that compared with the positive control group,10%triflumezopyrim suspension had the highest insecticidal activity.Field survey showed that,on the 14 th day after drug spray,the control effect of low,middle and high dose of 10%triflumezopyrim suspension was 95.16%,96.78%and100.00%on WBPH respectively,and 90.29%,96.07%and 93.81%on BPH respectively.High dose treatment had certain influence on spiders,21-35 days after drug spray,there was a little decline of spider numbers.Middle and low dose treatment had slightly influence on spiders in field.After 35 days of drug spray,the total number of spiders decreased a little.The safety of triflumezopyrim on spider was higher than that of the positive control group.10%triflumezopyrim suspension not only show good control effect on rice planthoppers,but also has relatively long lasting time,and less influence on the predator of planthopper.So,it could be prompted and applied in rice production.