三氟苯嘧啶种衣剂对褐飞虱控制效果研究

Dressing seeds with triflumezopyrim controls the brown planthopper Nilaparvata lugens(St?l)

【目的】明确三氟苯嘧啶种衣剂对褐飞虱Nilaparvata lugens(St?l)的防控效果,为利用三氟苯嘧啶种衣剂防控褐飞虱提供试验数据。【方法】2019-2021年,通过田间小区试验,调查三氟苯嘧啶种衣剂不同剂量下对褐飞虱若虫和成虫始见期和种群动态的影响,研究各处理条件下三氟苯嘧啶种衣剂对褐飞虱的防治效果。【结果】三氟苯嘧啶种衣剂能滞后田间褐飞虱成虫和若虫的始见期,50.0 ga.i./hm^(2)种子及以上剂量的三氟苯嘧啶种衣剂处理后,褐飞虱成虫和若虫的始见期分别滞后19 d和25 d以上。在三氟苯嘧啶种衣剂各剂量条件下,六(4)代和七(5)代褐飞虱种群数量均未超过防治指标。三氟苯嘧啶种衣剂对褐飞虱防治效果表现出较好的速效性和持效性,各剂量在播后53d之内对褐飞虱防控效果均超过94%,50.0 ga.i./hm^(2)种子及以上剂量处理播种后102 d对褐飞虱防控效果依然达94%以上。【结论】三氟苯嘧啶种衣剂能达到用药一次连续防控褐飞虱六(4)代和七(5)代的效果,实现减少化学药剂用量,轻简化栽培的目的。

[Objectives]To determine the effectiveness of dressing seeds with triflumezopyrim as a means of controlling the brown planthopper Nilaparvata lugens(St?l).[Methods]The population dynamics of N.lugens adults and nymphs were surveyed in paddy fields after host plant seeds had been dressed with triflumezopyrim between 2019 and 2021.[Results]Dressing seeds with≥50.0 ga.i./hm~2(grams active ingredient per ha)doses of triflumezopyrim delayed the first appearance of both adults and nymphs by≥19 days and 25 days,respectively.Population density decreased substantially in all plots treated with triflumezopyrim,indeed,there was not a single day on which the population density in triflumezopyrim treated plots reached the control threshold.The level of control achieved by dressing seeds with triflumezopyrim exceeded 94%over 53 days.Even when the survey was extended to 102 days,control still exceeded 94%at dosages of≥50.0 ga.i./hm~2.[Conclusion]Dressing seeds with≥50.0 ga.i./hm~2 triflumezopyrim can effectively control the sixth and the seventh generations of N.lugens,thereby reducing pesticide use and simplifying cultivation.