湖南不同地区小菜蛾对药剂敏感性比较

Study on resistance of Plutella xylostella in different areas in Hunan Province to insecticides

采用浸叶法在室内测定了湖南长沙和怀化地区小菜蛾Plutella xylostella(L.)田间种群对10种药剂的敏感性。结果表明:湖南长沙和怀化地区田间小菜蛾除对丁醚脲和BT制剂仍处于敏感(抗性倍数<3)状态外,对其它8种药剂产生了不同程度的抗药性,其中以长沙地区小菜蛾田间种群对高效氯氰菊酯抗性倍数最高(抗性倍数为33.58)。长沙和怀化种群对药剂的相对毒力倍数以巴丹最低(1.20)而以多杀菌素最高(2.59)。

Insects from two populations of Plutella xylostella （L.） were collected,one from Changsha （CS-Population） and one from Huaihua （HH-Population） in Hunan Province.The toxicity of 10 insecticides to insects from the two populations was tested by the leaf dipping method in the laboratory.The results suggest that diamondback moth populations in Changsha and Huaihua districts are relatively sensitive to Diafenthiuron and Bacillus thuringiensis （resistance ratio 3） and that the Changsha population has developed the highest levels of resistance to Beta-cypermethrin （resistance ratio of 33.58）.The relative toxicity ratio of the CS-and HH-Populations to insecticides ranged from 1.20 to 2.59,with the highest values being recorded for Padan and the lowest for Spinosad.