2021 Volume 20 Issue 2 Pages 233-239
Methods for suppressing southern blight of Jerusalem artichoke were examined. The growth of the pathogen in the medium and disease index of Jerusalem artichoke were both suppressed at pH 8 and above. Among fungicides registered for use on vegetables, sulfur agents suppressed growth of the pathogen in the medium. A suppressing effect was observed in the soil medium containing sulfur fertilizers. When Jerusalem artichokes were cultivated in soils containing sulfur fertilizers, the crops exhibited fewer symptoms. Additionally, mortality rates caused by southern blight during field cultivation were reduced with the application of sulfur fertilizers. On comparing disease resistance between two Jerusalem artichoke lines, Mitsuse conventional and Sunflower-potato, during field cultivation, the Sunflower-potato line exhibited lower mortality rates. These results suggest that sulfur fertilizers and the disease-resistant line, Sunflower-potato, may be used to suppress southern blight during cultivation. As sulfur fertilizers and resistant strains can be used in combination, an effect to suppress southern blight in Jerusalem artichokes might be expected.
