Effect of inoculum density ofCochliobolus sativuson common root rot of wheat and barley

Publisher Website
Google Scholar
Abstract
In a growth room study, the incidence (percentage of plants with symptoms) and intensity (severity of symptoms) of common root rot in the artificially inoculated spring wheat, cultivars Neepawa (moderately resistant) and Cypress (susceptible) and the spring barley, cultivars Bonanza (moderately resistant) and Melvin (susceptible) increased as the number of soilborne conidia of Cochliobolus sativus increased. Maximum disease intensity levels in the wheat and barley cultivars were attained with 10-60 and 50-120 conidia/cm3, respectively. In spite of disease incidence reaching 100% in many cases, the disease intensity was never higher than 75%. As inoculum density increased, the susceptible cultivars became relatively more severely diseased than the moderately resistant cultivars.