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田间试验结果表明:烯啶虫胺对水稻褐飞虱具有较好的速效性、持效性,药后3 d,50%烯啶虫胺WSG 22.5~52.5g/hm2对褐飞虱的防治效果为84.70%~90.81%;药后14~21 d,50%烯啶虫胺WSG 37.5~52.5 g/hm2对褐飞虱仍有89.84%~96.06%的防治效果。因此,从防治效果和防治成本的角度考虑,50%烯啶虫胺WSG防治水稻褐飞虱的适宜用量为37.5~52.5 g/hm2,防治适期在褐飞虱若虫高峰期,用水量不低于750 kg/hm2。
The results of field experiments showed that nitenpyram was effective and effective for the brown planthopper (Nilaparvata lugens), and the control effect of 50% nitenpyram WSG 22.5-52.5g / hm2 on N. lugens was 84.70% ~ 90.81%. From 14 to 21 days after treatment, 50% nitenpyram WSG 37.5-52.5 g / hm2 still possessed 89.84% ~ 96.06% of the control effect on BPH. Therefore, from the perspective of control effect and prevention and control cost, the suitable amount of nitenpyram WSG for controlling brown planthopper was 37.5-52.5 g / hm2, the control period was at the peak of nymphs of N. lugens, the water consumption was no less than 750 kg / hm2.