3种杀虫剂对杏树桃粉大尾蚜的防治试验

[目的]选取新烟碱类和三嗪酮类杀虫剂,通过对桃粉大尾蚜Hyalopterus arundinis的药效试验,明确3种药剂的防治效果、适宜质量浓度、持效期。[方法]采用"DMRT"法进行方差分析,并用邓肯氏新复极差法检验差异显著性。[结果]5%啶虫脒EC、5%吡虫啉EC 16.7、25 mg a.i./L,防治桃粉大尾蚜效果均较好,药后21 d的防治效果为99.78%～100%,明显高于50%吡蚜酮WG 166.7、250 mg a.i./L的防效。并且5%啶虫脒EC及5%吡虫啉EC各药剂处理间校正防效无显著差异。[结论]在实际应用中建议交替使用啶虫脒和吡虫啉,防止害虫抗药性的产生。

Experiment of Three Insecticides for Controlling Aphids in Apricot Field

Neonicotinoid and triazine ketones insecticides were selected to carry out the effective test against Hyalopterus arundinis to clarify the control effect,optimal concentration and persistence.[Methods] "DMRT" method was used to analyze variance and Duncan-style with new multiple range to test the significance of differences.[Results] Acetamiprid 5% EC 16.7,25 mg a.i./L and imidacloprid 5% EC 16.7,25 mg a.i./L showed good control against Hyalopterus arundinis.After 21 days control effect reached 99.78-100%,obviously higher than pymetrozine 50% WG 166.7,250 mg a.i./L.There is no evident difference of corrective effect between acetamiprid 5% EC 16.7,25 mg a.i./L and imidacloprid 5% EC 16.7,25 mg a.i./L.[Conclusions] In practical application,acetamiprid 5% EC 16.7 mg a.i./L and imidacloprid 5% EC 16.7 mg a.i./L should be used alternately to prevent development of pest resistance.