Occurrence of Entomosporium Leaf Spot on Photinia glabra in Korea
2010
Seo, S.T., Korea Forest Research Institute, Seoul, Republic of Korea | Kim, K.H., Korea Forest Research Institute, Seoul, Republic of Korea | Park, M.J., Korea University, Seoul, Republic of Korea | Shin, H.D., Korea University, Seoul, Republic of Korea
Japanese photinia(Photinia glabra), native to Japan, is an evergreen shrub belonging to the Rosaceae. The plant is widely grown for landscaping and gardening because the bright red foliage has ornamental value. In Korea, it is planted only in southern areas due to its poor winter hardiness. In April 2008, plantings in a nursery in Jeju were severely affected by a leaf spotting and defoliating disease(Fig. 1). The initial symptom of the disease appeared as minute circular spots on either side or on both sides of the leaves. On the young spots, the tan-colored centers with narrow reddish borders were slightly raised. The center of each spot had tiny black specks in which conidia produced by the fungus were found. Several small spots frequently coalesced to make large necrotic blotches in severe infections(Fig. 1C). The continued infection finally led to extensive premature defoliation of the affected trees(Fig. 1A and B).
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