Fig. 1

Wolbachia infection frequencies in each of 23 Belonocnema treatae populations distributed across the southern United States and sampled from three host plant species. Filled circles = Quercus fusiformis, filled squares = Quercus virginiana and filled triangles = Quercus geminata. Pie charts represent the percentage of B. treatae infected by Wolbachia in each population: white = uninfected individuals, yellow = wTre1, blue = wTre2, red = wTre3, grey = wTre4, orange = wTre1&3, green = wTre2&3, and purple = wTre1&2&3. Sample size per population is denoted by size of the pie diagram. Details of population localities, sample size, sample composition and infection frequencies are given in Table 1. Map adapted from Wikimedia commons (CC BY-SA 3.0)