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Mean infectivity of northern and southern Puccinia striiformis f.sp. tritici isolates for five incubation temperatures, on the (A) Acalou and (B) Victo host cultivar. Means and standard errors based on the averages of 10 northern and seven southern isolates. *Significant differences between northern and southern isolates at a given temperature, as revealed by Student–Newman–Keuls a posteriori tests. *P < 0.05; **P < 0.01.
