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Fig. 2. Isolation of (A) D. tritici-repentis and (B) S. nodorum from wheat following 1 yr of alternative crops, 2 yr of alternative crops, and continuous spring wheat. * Indicates that wheat following alternative crops, as a group, are significantly different from the continuous spring wheat treatment. (C) When spring wheat followed alternative crops, the number of individual alternative crop treatments with significantly less isolation of S. nodorum compared with continuous spring wheat. The continuous spring wheat treatment was used as the control in Dunnett's one-tailed test (P < 0.05).
