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Population Genetic Analysis Infers Migration Pathways of Phytophthora ramorum in US Nurseries

Figure 6

NA1 migration pathways.

Pie charts show the distribution of the two groups of NA1 isolates, as identified by Structure, among sampled states. Arrows indicate confirmed P. ramorum-positive nursery trace forwards. Blue arrows are 2004 trace forwards and red arrows are 2006 trace forwards. There were no confirmed trace forwards in 2005 or 2007.

Figure 6