EFFECTIVENESS OF SEED AND FOLIAR APPLICATION OF FUNGICIDES TO CONTROL ASCOCHYTA BLIGHT OF FABABEANS

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Abstract
Control of blight (Ascochyta fabae Speg.) of fababeans (Vicia faba L.) was attempted by using systemic and non-systemic fungicides in laboratory and field tests during 1974–1976. In the laboratory assays, all seed treatments containing the systemic fungicides benomyl or thiabendazole effectively controlled seed-borne Ascochyta but only soaking seeds in benomyl-thiram (0.2% a.i.) for 8 h effected complete eradication. In the field tests none of the seed treatments significantly reduced the seedling infection. When evaluated as foliar sprays, chlorothalonil was the most promising and was evaluated further on V. faba cultivars Erfordia and Ackerperle. One spray of this fungicide (0.1% a.i.) significantly reduced the disease severity in both cultivars. Seed infection was prevented only in Ackerperle by a minimum of two sprays 3 wk apart. In untreated plots, the disease was more severe in Erfordia than in Ackerperle.

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