Brown spot ofRheum officinale in indonesia with special reference to the variation in conidia of the causal fungus |
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| Authors: | S Retno Djiwanti Takao Kobayashi Masaomi Oniki |
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| Institution: | (1) Research Institute for Spice and Medicinal Crops (BALITTRO), JI. Tentara Pelajar 3, 16111 Bogor, Indonesia;(2) Forest Development Technological Institute, Rokubancho 7, Chiyoda-ku, 102 Tokyo, Japan;(3) National Institute of Agrobiological Resources, Kan'nondai 2-1-2, 305 Tsukuba, Ibaraki, Japan |
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| Abstract: | Brown spot disease ofRheum officinale, a traditional medicinal plant in South East Asia, was newly recorded from the highland area of West Java Province. After
confirmation of its pathogenicity towardRheum officinale and comparison of its morphology with hitherto known species, the casual fungus was identified asAscochyta rhei. It produces widely varied conidia from unicellular and bacillar conidia (Phoma-type), 1-septate oblong conidia (Ascochyta-type) to 2–3-septate cylindric conidia. These conidia were sometimes formed within the same pycnidium. They could germinate
easily and produce the similar colonies to each other.
Supported by “Joint Study Project for Strengthening Research on Diseases of Industrial Crops in Indonesia, Japan International
Cooperation Agency (JICA)” in BALITTRO. |
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| Keywords: | Ascochyta rhei Brown spot conidial variation medicinal crop new to Indonesia Rheum officinale |
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