Effects of Seed Treatments on Septoria nodorum Infection of Winter Wheat

SUMMARY Control of seed‐borne Septoria nodorum on winter wheat by seed treatment with one of two organomercury compounds at various rates, or with carboxin, maneb, guazatine, quinacetol sulphate or thiabendazole, was investigated in two field experiments in eastern England during 1973–75 and in growth‐room tests. All the non‐mercurial fungicides were as effective as the optimum rates of organomercury compounds in preventing seedling infection. Subsequent development of S. nodorum on the upper leaves, and of mildew, sharp eyespot and eyespot, was not influenced by seed treatment.