Maintaining high soil pH in planting row by lime applications with serial earthing-ups alleviate welsh onion white rot disease in cold season

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  • 土寄せ時の石灰施用による作条の高pH維持が低温期のネギ黒腐菌核病被害を軽減する
  • ツチヨセ ジ ノ セッカイシヨウ ニ ヨル サクジョウ ノ コウpH イジ ガ テイオンキ ノ ネギ クログサレキンカクビョウ ヒガイ オ ケイゲン スル

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Abstract

We examined the effect of lime applications with serial earthing-ups on welsh onion white rot disease in an infested field. By 4-serial lime applications from October until December, the rate of vendible welsh onions was raised from 3.3% to 24.0%. To define the effect of maintaining high soil pH in cold season, we carried out the inoculation test using a combination of leaf sheath disks and sclerotia at different pH values and temperatures. The disease incidence in leaf sheath disks with the initial pH 7.0 or 7.5 was significantly fewer than that with pH 6.5 or lower at 10 or 5°C. From these results, we suggest the benefit of the maintaining high soil pH in cold season to alleviate welsh onion white rot disease.

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