Results of bioassays are presented as percentage mortalities for respective insecticides as bars with standard deviations. Two-tailed Chi-square test was conducted to compare result of synergist assays with conventional one, using GraphPad Prism (GraphPad Inc., La Jolla, CA, USA). Two-tailed t-test was also conducted to compare the expression levels between the exposed and unexposed individuals. The frequencies of kdr mutations were respectively calculated using the formulae F(R) = (2 x RR + RS)/2N, F(S) = 1-F(R), where RR = Total number of homozygote resistant, RS = Total number of heterozygote resistant, S = susceptible individuals and N = total number of individuals.
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