| structure and migration in u.s. blumeria graminis f. sp. tritici populations. | while wheat powdery mildew occurs throughout the south-central and eastern united states, epidemics are especially damaging in the mid-atlantic states. the structure of the u.s. blumeria graminis f. sp. tritici population was assessed based on a sample of 238 single-spored isolates. the isolates were collected from 16 locations in 12 states (18 site-years) as chasmothecial samples in 2003 or 2005, or as conidial samples in 2007 or 2010. dna was evaluated using nine single nucleotide polymorphism ... | 2016 | 26623997 |