Objective To observe the effects of the two insecticide formulations by ultra-low-volume spraying in killing adult Aedes albopictus in the field, and to provide technical parameters for the on-site emergency disposal of dengue fever. Methods Two ultra-low-volume spray formulations (10% meperfluthrin·permethrin aqueous emulsion and 10.4% S-bioallethrin·permethrin aqueous emulsion) were used to kill adult Ae. albopictus from May 31 to June 10, 2019, in a residential area within a jurisdiction in Shenzhen, China. The human induced index method was used to monitor the density of Ae. albopictus, and the density changes of Ae. albopictus in the test and control areas after insecticide application were observed. The paired t-test and Mann-Whitney U test were used to compare the mosquito density at different times after application of different insecticides to evaluate their effects of killing adult mosquitoes. Results The mean relative density of Ae. albopictus decreased by 100%, 99.1%, and 59.5% at 0.5, 1.0, and 24.0 h, respectively, after spraying 10% meperfluthrin·permethrin aqueous emulsion, and by 99.4%, 96.1%, and 54.5% at 0.5, 1.0, and 24.0 h, respectively, after spraying 10.4% S-bioallethrin·permethrin aqueous emulsion. There were significant differences in mosquito density at 1.0 and 24.0 h after spraying of the two insecticides (t=6.176, P=0.025; t=16.411, P=0.004), but no significant difference was observed in mosquito density at 1.0 h after spraying of the two insecticides. The results showed that there was no significant difference in the adult mosquito-killing effect between the two insecticides (Z=-1.348, P=0.178). Conclusion Ultra-low-volume sprays of the two insecticide formulations can quickly reduce the density of adult Ae. albopictus, exhibiting an obvious control effect on Ae. albopictus.
QIN Yan-min, ZHANG Shao-hua, LIU Yang, DAI Chuan-wen, CHEN Jia-hui
. Effects of the two insecticide formulations by ultra-low-volume spraying in killing Aedes albopictus:an experimental field study[J]. Chinese Journal of Vector Biology and Control, 2021
, 32(2)
: 239
-242
.
DOI: 10.11853/j.issn.1003.8280.2021.02.024
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