3种剂型高效氯氟氰菊酯对白纹伊蚊现场防制效果研究

Field evaluation of three formulations of lambda-cyhalothrin in the control of Aedes albopictus

目的探索不同剂型高效氯氟氰菊酯和施药方式对白纹伊蚊的防制效果。方法2019年8-10月在苏州市虎丘区选择4个相对独立的苗圃种植基地,分别使用静电和非静电低容量喷雾器在白纹伊蚊栖息的植被上喷洒高效氯氟氰菊酯微囊悬浮剂、可湿性粉剂和悬浮剂;分别在喷洒前1周和喷洒后连续6周内采用人诱停落法监测白纹伊蚊密度变化,同时每周每块试验样地采集植被叶片约200 g,采用气相色谱-质谱联用技术(GC-MS)监测喷洒后植被叶面药物残留量变化。采用SPSS 16.0软件对数据进行统计分析,率的比较采用χ^(2)检验,计量资料采用t检验或方差分析。结果与对照组相比,白纹伊蚊密度在各试验组进行绿篱药物喷洒后,高效氯氟氰菊酯微囊悬浮剂可连续4~5周保持密度下降率>70.0%;悬浮剂可在2周内保持密度下降率>70.0%;可湿性粉剂仅能1周保持密度下降率>70.0%。微囊悬浮剂药物残留量在喷药后4周内维持在7.2~9.3 mg/kg之间,微囊悬浮剂静电喷雾1周后的药物残留量显著高于非静电喷雾,约为非静电喷雾的1.7倍,其持效期也长于非静电喷雾。结论绿篱施药技术可有效控制外环境白纹伊蚊密度,微胶囊悬浮剂防制白纹伊蚊效果明显优于可湿性粉剂和悬浮剂,持效时间可达4~5周;静电喷雾方式可显著提高植被药物沉积量,增强防制效果。

Objective To investigate the effect of different formulations and application methods of lambda-cyhalothrin in the control of Aedes albopictus in the field.Methods From August to October,2019,relatively independent nursery gardens were selected in Huqiu district of Suzhou,and electrostatic and non-electrostatic sprayers were used to spray lambda-cyhalothrin in the forms of microcapsule suspension,wettable powder,and suspension on the vegetation with Ae.albopictus.At 1 week before spraying and within 6 consecutive weeks after spraying,the human-baited landing method was used to monitor the density of Ae.albopictus;at the same time,about 200 grams of leaves were collected per experimental plot every week,and gas chromatography-mass spectroscopy was used to monitor the change in drug residue on leaves after spraying.SPSS 16.0 software was used for statistical analysis of data;the chi-square test was used for comparison of rates,and the t-test or an analysis of variance was used for comparison of continuous data.Results Compared with the control group,the experimental groups achieved a reduction rate of>70.0%in Ae.albopictus density for 4-5 consecutive weeks after the spraying of lambda-cyhalothrin microcapsule suspension on hedgerow;the suspension achieved a reduction rate of>70.0%in Ae.albopictus density for 2 weeks,while the wettable powder achieved a reduction rate of>70.0%for only 1 week.The residue of microcapsule suspension remained between 7.2 mg/kg and 9.3 mg/kg within 4 weeks after spraying;at 1 week after spraying,the residue of microcapsule suspension with electrostatic sprayer was about 1.7 times that with non-electrostatic sprayer,and microcapsule suspension with electrostatic sprayer had a longer effective duration than that with non-electrostatic sprayer.Conclusion Pesticide application on hedgerow can effectively control the density of Ae.albopictus in the external environment.Microcapsule suspension has a significantly better control effect on Ae.albopictus than wettable powder and suspension,with an effective duration of 4-5 weeks.Electrostatic spraying can significantly improve the amount of drug residue on vegetation and thus enhance the control effect on Ae.albopictus。