<Emphasis Type="Italic">Pythium</Emphasis> and <Emphasis Type="Italic">Phytophthora</Emphasis> species associated with root and stem rots of kalanchoe |
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| Authors: | Hideki Watanabe Yoshihiro Taguchi Mitsuro Hyakumachi Koji Kageyama |
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| Institution: | (1) Gifu Prefectural Research Institute for Agricultural Sciences, 729 Matamaru, Gifu 501-1152, Japan;(2) Gifu Prefectural Agricultural Extension Planning Office, Gifu, Japan;(3) Faculty of Applied Biological Sciences, Gifu University, Gifu, Japan;(4) River Basin Research Center, Gifu University, Gifu, Japan;(5) Present address: Arysta Life Science, 38-39F St. Luke's Tower, 8-1 Akashi-cho, Chuo-ku, Tokyo 104-6591, Japan |
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| Abstract: | Pythium and Phytophthora species were isolated from kalanchoe plants with root and stem rots. Phytophthora isolates were identified as Phytophthora nicotianae on the basis of morphological characteristics and restriction fragment length polymorphism (RFLP) analysis of the rDNA-internal
transcribed spacer regions. Similarly, the Pythium isolates were identified as Pythium myriotylum and Pythium helicoides. In pathogenicity tests, isolates of the three species caused root and stem rots. Disease severity caused by the Pythium spp. and Ph. nicotianae was the greatest at 35°–40°C and 30°–40°C, respectively. Ph. nicotianae induced stem rot at two different relative humidities (60% and >95%) at 30°C. P. myriotylum and P. helicoides caused root and stem rots at high humidity (>95%), but only root rot at low humidity (60%). |
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| Keywords: | Pythium myriotylum Pythium helicoides Phytophthora nicotianae rDNA-ITS Kalanchoe Root and stem rots |
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