The effect of soil-surface residue level (0, 10, 15, and 85% soil coverage) on the progress of gray leaf spot of corn, caused by Cercospora zeae-maydis, over time was studied in Ohio during two environmentally different growing seasons. Area under the disease progress curve (AUDPC) was calculated and analyzed with analysis of variance followed by orthogonal polynomials (.)
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Nilceu Ricetti Xavier de Nazareno (1993) studied this question.