Effects of the Herbicide Chlorsulfuron on Rhizoctonia Bare Patch and Take-All of Barley and Wheat. A. D. Rovira, CSIRO Division of Soils, Private Bag 2, Glen Osmond, S.A. 5064, Australia. H. J. McDonald, CSIRO Division of Soils, Private Bag 2, Glen Osmond, S.A. 5064, Australia. Plant Dis. 70:879-882. Accepted for publication 6 March 1986. Copyright 1986 The American Phytopathological Society. DOI: 10.1094/PD-70-879.

Measurements on two crops of direct-drilled barley in soil treated with chlorsulfuron at 15 g/ ha 12 mo previously showed an increase in patches of poor growth and yield losses of 0.70 and 1.54 t/ha where the herbicide had been applied. Controlled-environment experiments with Rhizoctonia solani showed that chlorsulfuron at the equivalent of 2.5 g/ha significantly increased root disease caused by R. solani in wheat and barley. Chlorsulfuron had no effect on the incidence and severity of lesions caused by Gaeumannomyces graminis var. tritici on wheat.