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A severe gummosis on yuzu caused by Phytophthora sp. has occurred in several areas of southern parts of Chonnam and Kyungnam provinces in Korea. Infected trees showing a destructive bark rot on lower trunks were usually accompanied by abundant gum exudation. The disease initiated at grafting sites b...

A severe gummosis on yuzu caused by Phytophthora sp. has occurred in several areas of southern parts of Chonnam and Kyungnam provinces in Korea. Infected trees showing a destructive bark rot on lower trunks were usually accompanied by abundant gum exudation. The disease initiated at grafting sites below the soil line and progressed upward. Foliage of the severely affected tree turned yellow and dropped earlier than that of healthy. The disease spread widely at Koheung and Namhae areas and less extended at Posung, Yeochon, and Wando. However, the disease has not been found in Cheju island. A species of Phytophthora was constantly isolated from freshly infected inner tissues of trunks and all isolates collected were identified as P. nicotianae based on their mycological characteristics. Among 19 isolates tested, 15 were designated as A1 and 4 were as A2 mating types. The fungus showed strong pathogenicity to yuzu seedlings when artificially inoculated. This is the first report of yuzu gummosis caused by P. nicotianae in Korea.

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