昆明地区鲜切花产区朱砂叶螨抗药性监测

采用玻片浸渍法测定了昆明地区花卉朱砂叶螨Tetranychus cinnabarinus(Boisduval)对阿维菌素、甲氨基阿维菌素苯甲酸盐、溴虫腈、丁醚脲、炔螨特和哒螨灵的抗性。结果表明,昆明北郊和呈贡地区玫瑰上的朱砂叶螨雌成螨对阿维菌素与甲氨基阿维菌素苯甲酸盐产生了极高的抗药性,阿维菌素对2个地区的朱砂叶螨的LC50分别为40.25mg·L-1和19.67mg·L-1,相对毒力指数分别为敏感品系的2441.08倍和1192.86倍;甲氨基阿维菌素苯甲酸盐对其LC50分别为118.18mg·L-1和9.24mg·L-1,相对毒力指数是敏感品系的2805.73倍和219.35倍。昆明北郊的朱砂叶螨对溴虫腈的相对毒力指数是敏感品系的2371.40倍,呈贡和晋宁分别为162.01倍和173.38倍。丁醚脲对北郊、呈贡和晋宁朱砂叶螨的LC50分别为244.58mg·L-1、385.41mg·L-1和54.93mg·L-1,相对毒力指数在3.01倍～21.10倍之间。北郊、呈贡和晋宁的朱砂叶螨种群对炔螨特和哒螨灵的LC50分别为155.39mg·L-1、424.49mg·L-1和62.70mg·L-1,其相对毒力指数是敏感品系的6.45倍、17.63倍和2.60倍。朱砂叶螨对药剂抗药性水平趋势从高到低为:阿维菌素、甲氨基阿维菌素苯甲酸盐>溴虫腈、丁醚脲>炔螨特、哒螨灵,抗性最高的地区为昆明北郊,晋宁相对较低。

Monitoring pesticide resistance of Tetranychus cinnabarinus in Kunming＇s flower regions

The pesticide resistance of field populations of Tetranychus cinnabarinus（Boisduval）collected from 3 main flower regions of Kunming was determined using the slide-dip method.A susceptible strain was maintained in the laboratory as control.LC50 of the T.cinnabarinus Beijiao strain（collected from Kunming＇s Beijiao area）to Avermectin,Methylamino abamectin benzoate,Chlorfenapyr,Diafenthiuron,Propargite and Pyridaben,were 40.25,118.18,386.99,244.58,155.39 and 68.85 mg·L-1,respectively.Respective resistance was 2 441.08-,2 805.73-,2 371.40-,13.39-,6.45-and 8.43-times that of the control.The resistance of the Chenggong strain（collected from Kunming＇s Chenggong area）to Avermectin,Methylamino abamectin benzoate,Chlorfenapyr,Diafenthiuron,Propargite and Pyridaben was 1192.86-,219.35-,162.01-,21.10-,17.63-and 7.01-times that of the control.The Jinning population was still relatively sensitive to the tested pesticides.