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目的了解朝阳区不同区域德国小蠊对杀虫剂的抗性水平及分布情况。方法按行政区划选定8个取样点,采集每个取样点的德国小蠊自然种群,带回实验室繁育,用药膜接触法测定其对7种杀虫剂的抗性系数。比较德国小蠊对7种杀虫剂的抗性程度差别;比较8个取样点德国小蠊种群的抗性差别,并以类平均法做聚类分析。结果德国小蠊对7种杀虫剂的抗性程度差异具有统计学意义(χ2=26.880,P=0.000),对有机磷类杀虫剂的抗性最高(χ2=20.494,P=0.000);8个取样点德国小蠊种群对杀虫剂抗性水平差异亦有统计学意义(χ2=29.143,P=0.000),根据聚类分析结果和专业知识可将其划分为4类。结论朝阳区德国小蠊对杀虫剂存在地理位置差别,抗性监测和指导用药时“以点代面”做法不可取。
Objective To understand the insecticide resistance level and distribution of Blattella germanica in different regions of Chaoyang District. Methods Eight sampling sites were selected according to the administrative divisions. The natural population of Blattella germanica at each sampling point was collected and brought back to the laboratory for breeding. The resistance coefficient to seven insecticides was determined by membrane contact method. The differences of the resistance of Blattella germanica to seven insecticides were compared. The differences of resistance of Blattella germanica from eight sampling sites were compared, and the cluster analysis was done by the class average method. Results The resistance of Blattella germanica to seven kinds of insecticides was statistically significant (χ2 = 26.880, P = 0.000), and highest for organophosphate insecticides (χ2 = 20.494, P = 0.000). There was also a significant difference in the level of insecticide resistance between the cockroach cockroach populations at 8 sampling points (χ2 = 29.143, P = 0.000). According to the results of cluster analysis and professional knowledge, they could be divided into 4 groups. Conclusion The difference of the geographical position of Blattella germanica to insecticides exists in Chaoyang District. It is not advisable to use the method of “point generation surface” in monitoring and guiding drug use.