Abstract
Efficacy of the fungicide flutolanil was assessed for control of Rhizoctonia blight, caused by Rhizoctonia solani Kühn, on monostands and blends of two tall fescue ( Festuca arundinacea Schreb.) cultivars. The cultivars Kentucky 31 (moderately resistant to R. solani) and Mojave (susceptible) were seeded in six treatments of ratios between 100 : 0 and 0 : 100 of each cultivar, respectively. The monostands and blends were raised to maturity and treated with six rates of flutolanil ranging from 3.4 to 1.1 kg a.i. ha -1. An increase in the proportion of Kentucky 31 in a blend, and application rate of flutolanil acted additively to significantly ( P⩽0.05) suppress the progress of Rhizoctonia blight. Incorporation of Kentucky 31 in all blends, however, failed to limit disease to acceptable levels (<10%) when less than a label rate of fungicide was applied. Greater levels of Rhizoctonia resistance must be identified and incorporated into tall fescue cultivars before host resistance can be used to limit fungicide applications.
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