Abstract
The effect of varying interplant competition on common root rot and yield was examined in barley over a 4-yr period. One experiment studied the effects of thinning. Other tests with a constant level of interplant competition examined the effects of interplanted root-rot-resistant barley or oat cultivars on the root rot reaction and yield of susceptible barley cultivars. Increasing interplant spacing by thinning reduced root rot significantly in Gateway and Bonanza barley in 1 out of 4 years, but yield was increased significantly only in Gateway in 2 out of 4 years. Yield reduction due to root rot was significantly less in 1 out of 2 years when the distance between Gateway plants was increased due to the interplanting of oats. The lack of a consistent reduction in root rot or yield loss by reducing plant competition or interplanting with moderately resistant barley or oats precludes use of lower seeding rates or mixed crops as an economic method of reducing root rot.Key words: Interplant competition, common root rot, barley
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