Effect of Tillage and Wheat Residue Management on the Vertical Distribution and Inoculum Density ofCochliobolus sativusin Soil

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Abstract
Propagules of C. sativus in soil were significantly more numerous in plots where wheat following soybean was seeded conventionally than where direct drilling was practiced. Burning wheat residue significantly reduced the population of the pathogen in soil compared with plots where the residue was retained. Propagule numbers decreased with soil depth; 90% of the propagules occurred in the top 0-10 cm of soil. Propagules were most generally distributed in soil when conventional seeding practices were used.