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Fig. 3. Number of lesions and percentage necrosis on spring wheat leaves following 1 yr of an alternative crop (Group 1) in 2004 and 2005. In (A), (C), and (D), treatments following alternative crops are significantly less than the continuous spring wheat treatment. In (B), treatments following alternative crops are significantly less than the continuous spring wheat treatment, except for the treatment with lentil as the previous crop on 9 June 2004. The continuous spring wheat treatment was used as the control in Dunnett's one-tailed test (P 
0.05).
