陕西关中地区杀虫剂清园措施对桃树桃蚜种群的影响

摘要

在田间条件下研究了陕西关中地区5种杀虫剂在不同时间进行清园处理对桃树桃蚜种群的影响。结果表明，两次施药对桃蚜种群的增长均有较好的控制效果，尤以第1次施药后45 d 内和第2次施药后30 d 内，即5月6日前控制效果明显。但5月6日以后，各药剂处理的控制效果均明显下降，至第1次施药后的第60天和第2次施药后第45天，有的药剂处理已经完全失去了控制效果。早春清园对桃蚜种群的早期增长有较好的防治效果，但此时桃蚜种群数量总体偏低，直接危害并不严重，从减少用药次数和用药量的角度，早春清园预防桃蚜有无必要值得进一步试验研究。%Effects of five kinds of insecticides on controlling Myzus persicae (Sulzer)by orchard cleaning at differ-ent time were investigated in Guanzhong region of Shaanxi Province.The results showed that all treatment of pes-ticides sprayed at different time had good effects on controlling peach aphids population,especially in 45 days af-ter the first spraying and in 30 days after second application.Therefore,the control effects were obvious before May 6th,but decreased obviously after May 6th.Some treatments even completely failed to control peach aphids after 60 days of the first spraying and 45 days of the second application.Cleaning orchard has positive effect on control of peach aphids in early spring,however,its population density is low at that time,and the direct damages are not very serious.Considering reduction of pesticide application,whether it is necessary to clean orchard by pesticide application in early spring is worth studying in the further experiment.