Clubroot of cabbage and ornamental turnip rape for landscape in Kagoshima Prefecture
2016
Higuchi, K. (Kagoshima Prefectural Institute for Agricultural Development, Minamisatsuma, Kagoshima (Japan)) | Omatsu, N. | Higashi, S. | Shirao, T. | Nagatomo, M. | Tanaka, Y. | Matsumoto, S. | Inoue, H.
In 2013, clubroot disease on cabbage and ornamental turnip rape for landscape was observed in Ibusuki City, whereas there had been no report of the disease since 2001 when the first incidence was reported in Kagoshima Prefecture. According to the present survey, instances of the disease were observed in eight districts of Kagoshima and there were many infested fields clustered in Ibusuki City, whereas there were few fields infested in other districts. The severity level of these infested fields was relatively low with a range of resting spore densities from 10E3 to 10E4 /g soil. Averages of the soil pH in each field ranged from 5.5 to 6.3 hence there were no suppressive field soils this pH values exceeding 7, and in some fields the incidence of clubroot might be promoted by soil with a low phosphate absorption coefficient. The virulence of field isolates of resting spores was relatively weak thus the introduction of CR cultivars seems to be an effective tactic to solve with problem.
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