Effect of Tillage and Wheat Residue Management on the Vertical Distribution and Inoculum Density of Cochliobolus sativus in Soil. E. M. Reis, Centro Nacional de Pesquisa de Trigo, Passo Fundo, RS, Brazil. J. J. R. Abrão, Centro de Experimentação e Pesquisa-FECOTRIGO, Cruz Alta, RS, Brazil. Plant Dis. 67:1088-1089. Accepted for publication 5 April 1983. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-1088.

Propagules of Cochliobolus 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 ocurred in the top 0–10 cm of soil. Propagules were most generally distributed in soil when conventional seeding practices were used.