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First report of Phytophthora palmivora as a causal pathogen of citrus brown rot in Japan |
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| Authors: | Nobuya Tashiro Seiji Uematsu Youichi Ide Masafumi Matsuzaki |
| Institution: | 1. Saga Prefectural Upland Farming Research and Extension Center, 1471-6 Hayata, Chinzei, Karatsu, Saga, 847-0326, Japan 2. Chiba Prefectural Agriculture and Forestry Research Center, 808 Daizenno, Midoriku, Chiba, 266-0006, Japan 3. Saga Prefectural Fruit Tree Experiment Station, Haruke, Ogi, Saga, 845-0014, Japan 4. Nihon Nohyaku Co., Ltd., Fukuoka Branch, 1-13-21 Tenjin, Fukuoka, 810-0001, Japan |
| Abstract: | A fruit rot, similar to brown rot, occurred on extremely early ripening Satsumas in Saga Prefecture in the early autumn of 1999. A single species of Phytophthora was isolated from the affected fruit. After nonwounding inoculation of healthy fruits of Citrus spp. including Satsuma with the isolated fungus, the fungus was reisolated from fruit with symptoms similar to those in nature. On the basis of its morphology and molecular analysis of the rDNA-internal transcribed spacer regions, the pathogen was identified as P. palmivora. This is the first report of P. palmivora as a causal pathogen of citrus brown rot in Japan. |
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