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Fig. 4. Number of lesions and percentage necrosis on spring wheat leaves following 2 yr of an alternative crop (Group 2) in 2004 and 2005. (A) Treatments following alternative crops are significantly less than the continuous spring wheat treatment. (B) Treatments following alternative crops are significantly less than the continuous spring wheat treatment, except for the treatment with sunflower as the previous crop for the 23 June 2004 evaluation. (C) Disease severities following alternative crops are significantly less than the continuous spring wheat treatment. (D) Disease severities following alternative crops are significantly less than the continuous spring wheat treatment, except for the treatment with corn and sunflower as the previous crop for the 28 June 2005 evaluation. The continuous spring wheat treatment was used as the control in Dunnett's one-tailed test (P 
0.05).
