Influence of Flutolanil and Tolclofos-Methyl on Root and Culm Diseases of Winter Wheat

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Abstract
Two fungicides with high toxicity to species of Rhizoctonia were absorbed onto a granular fertilizer and banded in, below, or between the seed furrows at the time of planting winter wheat [Triticum aestivum]. 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.