Fig. 1

Schematic map of collection sites for Aedes albopictus in China and the codon composition of the mutant 1534 alleles of the voltage-gated sodium channel gene (VGSC) gene in the samples. Red balloons indicate the sampling sites (for details see Additional file 1: Table S1). The codon composition of the 1534 allele in each site is represented by a pie chart, with green indicating the wild-type F1534 allele; yellow, mutant allele F1534S; and blue, mutant allele F1534L/C/R/W (for details see Additional file 1: Table S2). The red-dashed squares indicate multiple mosquito collection points in a group