Influence of Flutolanil and Tolclofos-Methyl on Root and Culm Diseases of Winter Wheat. R. W. Smiley, Oregon State University, Columbia Basin Agricultural Research Center, P.O. Box 370, Pendleton, OR 97801. W. Uddin, S. Ott, and K. E. L. Rhinhart. Oregon State University, Columbia Basin Agricultural Research Center, P.O. Box 370, Pendleton, OR 97801. Plant Dis. 74:788-791. Accepted for publication 24 April 1990. Copyright 1990 The American Phytopathological Society. DOI: 10.1094/PD-74-0788.

Two fungicides with high toxicity to species of Rhizoctonia were adsorbed onto a granular fertilizer and banded in, below, or between the seed furrows at the time of planting winter wheat. Experiments were performed under conventional tillage (chisel plow and disk) and no-tillage systems. Flutolonil and tolclofos-methyl were each highly toxic to growth of R. solani AG-8 and R. oryzae in vitro, were inconsistent in suppressing the incidence and severity of Rhizoctonia root rot in the field, and did not significantly reduce the incidence of take-all or eyespot. Mixing metalaxyl with each of the primary fungicides did not improve disease control. Application of a starter fertilizer at planting increased the severity of Rhizoctonia root rot in a no-till system but had no effect on the disease when wheat was grown with a conventional-tillage system. Fungicides did not improve the yield of grain in these experiments.