N-3型无人直升机施药方式对稻飞虱和稻纵卷叶螟防治效果的影响

为了阐明喷洒药械N-3型无人直升机(N-3 UAV)对稻飞虱和稻纵卷叶螟的防治效果及应用前景,进行了飞机不同作业高度和不同喷洒浓度的田间药效试验.结果表明,在水稻分蘖后期,飞机每公顷喷洒48％毒死蜱·锐劲特EC 432 g(有效成分,下同),施药后3、5、10d对稻飞虱的防治效果为96.93％、92.21％、88.12％,对稻纵卷叶螟的保叶效果为63.29％、54.00％、58.33％,均优于传统担架式喷雾机喷洒防治效果.在水稻孕穗期,无人机在3m和5m的作业高度下,每公顷喷洒25％吡蚜酮SC 75 g,施药后10 d对稻飞虱的防治效果与每公顷喷洒60 g和52.5 g时防治效果无显著差异；每公顷施用40％二嗪·辛硫磷EC 480 g和384 g防治稻纵卷叶螟,施药后10d,3m作业高度下的杀虫效果均达90.90％,优于5m和7m的杀虫效果.

Effects of N-3 UAV spraying methods on the efficiency of insecticides against planthoppers and Cnaphalocrocis medinalis

The efficacy and applications of N-3 unmanned aerial vehicle (UAV) were determined against rice pests in paddy field tests at different flight heights and different spraying concentrations. The result of field test showed that under a dosage of 432 g/hm² (ai) of 48% chlorpyrifos·regent EC at late rice tillering, the efficacy of 3, 5 and 10 days after treatment with N-3 UAV spraying was as high as 96.93%, 92.21% and 88.12%, respectively in terms of rice planthoppers. On Cnaphalocrocis medinalis Guenée, 63.29%, 54.00% and 58.33% rice leaves could be kept healthy, those are both superior to the efficacy of spraying with stretcher mounted sprayer. The N-3 UAV worked at the height of 3 and 5 meters under a dosage of 75 g/hm² of 25% pymetrozine SC at the rice heading stage, the efficacy of 10 days after treatment has no significantly different with a dosage of 60 g/hm² and 52.5 g/hm² of 25% pymetrozine SC. On C.medinalis, the efficacy of 10 days after treatment with N-3 UAV spraying at the 3 meters height was as high as 90.90% under a dosage of 480 g/hm² or 384 g/hm² of 40% diazinon·phoxim EC. It is better than the efficacy of the N-3 UAV working flight at 5 meters or 7 meters height.