Tan spot (caused by Pyrenophora tritici-repentis) severity was determined for wheat (Triticum aestivum) grown in rotation with sorghum (Sorghum bicolor), which allowed a 15-mo break between wheat crops, and was compared with severity in wheat grown continuously. Three wheat residue management schemes were used within each crop sequence: chisel plow, V-blade, and no-till for the wheat-sorghum rotation and moldboard plow, chisel plow, and no-till for continuous wheat. Tan spot severity was determined during 4 yr; multiple ratings were taken in the last 2 yr for the calculation of area under the disease progress curve (.)
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W. W. Bockus (1992) studied this question.