Abstract
Winter wheat cultivars Stephens and Nugaines were grown in soil adjusted to pH 4.6-7.7 and −0.01 MPa matric potential. Root-wounding, inoculum density of Cephalosporium gramineum, and soil pH each influenced the percentage of headed tillers with Cephalosporium stripe. In unwounded plants, average incidence of diseased tillers increased from 0.5 to 22.0% as inoculum density increased from 3.4 to 6.4 log 10 conidia/g of soil, and from 8.0 to 17.5% as soil pH decreased from 7.6 to 4.7. With plants whose root systems were cut immediately before infesting soil with conidia, average disease incidence increased from 16.1 to 76.7% as inoculum density increased from 1.4 to 4.4 log 10 conidia/g (...)
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