Plot of Gff host Spiroplasma infection, STRUCTURE assignment to nuclear genetic background (NWGU, NEGU, and WGU), and mtDNA haplogroup (A, B, and C). Each bar represents a single individual. The top panel shows presence/absence of Spiroplasma of each individual (gray = negative, black = positive). The middle panel shows the STRUCTURE assignment to nuclear genetic background of each individual (pink = northwest genetic unit, blue = northeast genetic unit, green = west genetic unit). The bottom panel shows the mtDNA haplogroup assignment (indicated by colored boxes) to each individual (pink = mtA, blue = mtB, green = mtC, blank = missing data). Numbers below the bar plot correspond to the 26 sampling sites shown on the map in Fig 1.