Figure 2.

Multilocus haplotype network for Erysiphe necator. Network constructed in TCS 1.21 [60,61]. Each haplotype is represented as a circle proportional in size to the number of isolates in each haplotype. Inferred intermediate haplotypes are represented by a small solid dot. Each line segment represents a single mutation. The numbers defining multilocus haplotypes in Table 2 are shown to the right of each node. Geographic origins of isolates in each haplotype are proportionally represented in pie charts by different patterns shown in the key in the upper left. The haplotypes that include group B isolates are enclosed in a magenta ellipse and marked with a 'B'; the haplotype that includes group A isolates is enclosed in a green ellipse and marked with an 'A'; and the haplotypes that include isolates from muscadine grapes (V. rotundifolia) are enclosed in a blue ellipse and are marked with an 'M'. The ancestral haplotype determined by root probability [33] is indicated by an asterisk (*), whereas that determined by maximum parsimony using E. necator var. ampelopsidis as an outgroup is indicated by §.