Objective To investigate the insecticidal efficacy of common insecticides for bed bugs in the laboratory by bed bug bioassay, and to establish the median lethal dose (LD50) system for beg bugs. Methods Micro-topical application was used to determine the mortality rate of Cimex lectularius at different doses of common insecticides, and the probability unit regression method was used to calculate LD50 of different insecticides against bed bugs. Results The LD50 of thiamethoxam oxazine, imidacloprid, chlorpyrifos, dichlorvos, fenthion, λ-cyhalothrin, and fipronil for C. lectularius was 0.003 57, 0.000 91, 2.388 1, 1.934 7, 0.074 4, 9.370 7, and 0.081 47 μg/bug, respectively. As for insecticides with high level of resistance, the approximate value of LD50 was also preliminarily evaluated using pre-experiment, and the LD50 of these insecticides against C. lectularius was basically 0.5 μg/bug or above. Combined with the pre-experiment results of common pesticides for which LD50 had not been measured, it was inferred that all the common insecticides tested ranked as follows in terms of their insecticidal effect on bed bugs:nicotinoids, phenylpyrazoles, organophosphorus, pyrethroids, carbamates, and organic chlorides. Conclusion In the process of chemical control of bed bugs, nicotinoids and phenylpyrazoles, which are sensitive to bedbugs, should be the first choice, and the fenthion of organophosphorus is also a good choice.
JIA Xiao-kai, GAO Chun-hua, ZHOU Dan-dan, WEI Fu-rong, LIU Qi-yong, REN Dong-sheng
. Measurement of the median lethal dose of several common insecticides against Cimex lectularius[J]. Chinese Journal of Vector Biology and Control, 2020
, 31(1)
: 46
-48
.
DOI: 10.11853/j.issn.1003.8280.2020.01.010
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