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.
GU Deng-an, SUN Ai-juan, MA Xiao-yan, CHEN Xue-liang
. Field evaluation of three formulations of lambda-cyhalothrin in the control of Aedes albopictus[J]. Chinese Journal of Vector Biology and Control, 2021
, 32(1)
: 107
-110
.
DOI: 10.11853/j.issn.1003.8280.2021.01.023
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