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First level (Key 1) separated the 14 Pl. halstedii pathotypes in 5 groups with 3 markers. Second level (Key 2) used five other markers to distinguish 12 subgroups of pathotypes, and especially 6 subgroups of multi-isolate pathotypes (Red boxes). 100 and 304, 314 and 714 pathotypes could not be distinguished. 1Pl. halstedii pathotypes with only one isolate available.
