Bayleton in the control of powdery mildew in winter wheat

Benada, J.; Vanova, M.

Sbornik UVTIZ (Ustav Vedeckotechnickych Informaci pro Zemedelstvi) Ochrana Rostlin 20(1): 29-38

1984


Accession: 004813696

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Abstract
In 1977-1981, the efficacy of the Bayleton fungicide Triadimefon in the control of powdery mildew on wheat was tested in small-plot field trials. It was only in 1981 that the plants of the Sava cultivar, grown after lucerne, were infected more seriously and the treatment increased the yield by up to 17%. In the remaining years when the infection rate was low, the phytotoxicity of the chemical was tested. In 'Sava' infected to a low degree, Bayleton caused no significant decrease in yields, irrespective of the application time (at earing time, at flowering time). The Bayleton fungicide had a high fumigant effect which manifested itself as a reduction of infection in the adjacent untreated stands and as an increase in their yields. When the treatment was performed at the beginning of earing, the fumigant action did not suffice for the protection of the later-earing tillers. The following problems are discussed: when infection by powdery mildew [Erysiphe gramminis] of cereals, importance of resistance for signalization and prognosis of treatment, problems of the effect of fungicides on infection, relation of the infection to crop yields, determination of the best term of application, and economic aspects of treatment.