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Fig. 5. Number of lesions and percentage necrosis on spring wheat leaves following 2 yr of an alternative crop with different residue levels (Group 3) in 2004 and 2005. (A–D) Disease severity following alternative crop sequences is significantly less than the continuous spring wheat treatment. The continuous spring wheat treatment was used as the control in Dunnett's one-tailed test (P 
0.05). CO = corn, CP = chickpea, ML = proso millet, SN = sunflower, SR = grain sorghum, and SW = spring wheat.
