Sporulation of Cochliobolus sativus on Residues of Winter Crops and Its Relationship to the Increase of Inoculum Density in Soil. E. R. Reis, National Wheat Research Center-EMBRAPA, Caixa Postal 569, 99100, Passo Fundo, RS, Brazil. W. A. Wünsche, National Wheat Research Center-EMBRAPA, Caixa Postal 569, 99100, Passo Fundo, RS, Brazil. Plant Dis. 68:411-412. Accepted for publication 30 November 1983. Copyright 1984 The American Phytopathological Society. DOI: 10.1094/PD-68-411.

The inoculum density of Cochliobolus sativus in the soil was related to the amount of fungal sporulation occurring on crop residues. Spore counts were higher from residues of Gramineae than from broadleaf plants. The fungus produced the highest number of conidia on the residue of rye, and this corresponded to the highest propagule counts in the soil 1 yr later.

Keyword(s): common root rot, Triticum aestivum, wheat.