Objective To investigate the killing efficacy of several commonly used public health insecticides for the control of millipedes, and to provide scientific evidence for millipede control. Methods The insecticide screening test was performed to determine the toxicity of five insecticides with different insecticidal mechanisms to millipedes. The median lethal dose (LD50) of 15% beta-cypermethrin·propoxur suspension concentrate (SC) was estimated, followed by simulated filed testing to verify its killing efficacy. Excel 2016 and SPSS 19.0 softwares were used for data analysis. The Chi-squared test was used to compare the knockdown effects of different insecticides on millipedes. Results The insecticide screening test showed that the 100 fold dilutions of 15% beta-cypermethrin·propoxur SC, 12% beta-cypermethrin·chlorpyrifos emulsifiable concentrate (EC), 10% lambda-cyhalothrin wettable powder, 20% propoxur EC, and 10% imidacloprid SC had:median knockdown times (KT50) being 1.78, 8.55, 43.17, 1.15, and 9.23 min, respectively; times taken to knockdown 90% of millipedes (KT90) being 2.63, 20.02, 68.83, 2.03, and 22.80 min, respectively; 2-h mortality rates after insecticide application being 76.25%, 56.25%, 73.33%, 56.67%, and 46.67%, respectively; and 24-h mortality rates all being 100%. The 200 fold dilutions of the five insecticides had:KT50 being 2.08, 23.26, 56.00, 1.49, and 52.78 min, respectively; KT90 being 3.15, 33.35, 85.68, 2.98, and 79.55 min, respectively; 2-h mortality rates being 65.00%, 47.50%, 68.33%, 40.00%, and 36.67%; and 24-h mortality rates all being 100%. The laboratory toxicity test showed that the LD50 of 15% beta-cypermethrin·propoxur SC against millipedes was 5.42 mg AI/m2. The simulated field test showed that the 24-h mortality rates of millipedes with 15% beta-cypermethrin·propoxur SC at 7.5, 15.0, and 30.0 mg AI/m2 were 98.33%, 100%, and 100%, respectively. Conclusion Among the five commonly used insecticides, 15% beta-cypermethrin·propoxur SC has relatively excellent efficacy in killing millipedes, which provides a reference for insecticide selection to control millipedes in public environment.
ZHENG Feng-yun, CHEN Feng-ling, HUANG He
. Comparative study on the killing efficacy of 15% beta-cypermethrin·propoxur suspension concentrate and other four insecticides on millipede[J]. Chinese Journal of Vector Biology and Control, 2022
, 33(3)
: 438
-441
.
DOI: 10.11853/j.issn.1003.8280.2022.03.024
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