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No.26 (1979/12) >

 
Title :パインアップル root rot wilt に関する研究 : 第 3 報沖縄における本病の病原菌の究明(農学科)
Title alternative :Studies on the root rot wilt of the pineapple : 3. Identification of causal fungi of the disease in the Okinawa Islands (Department of Agriculture)
Authors :田盛, 正雄
大嶺, 和子
Authors alternative :Tamori, Masao
Omine, Kazuko
Issue Date :11-Dec-1979
Abstract :本論文では, パインアップルroot rot wiltの病原を確認する目的で, 鉢植えパインアップルに対して数種の菌を接種し, 病徴の再現を試みた。接種試験の結果, Phytophthora cinnamomiとPhytophthora nicotianae var.parasiticaを生育初期に接種した株は, 根腐れが激しく根の乾重が非常に軽く, 草丈は極端に低く, 葉も退緑し, 典型的な萎ちょう症状になった。両菌を生育後期に接種しても, やはり根腐れをおこし, 葉はしおれ, 急性的な萎ちょう症状になった。土壌の種類によっても発病に差があるようで, 島尻マージ土壌よりも, 粘質性の国頭マージ土壌において発病がやや多かった。今回の接種試験と, 以前に行った圃場調査等の結果から, 沖縄で発生しているパインアップル萎ちょう病の大部分は, root rot wiltであり, その主因は, Phytophthora cinnamomiとPhytophthora nicotianae var.parasiticaであると結論する。なお, Pythium sp.も弱い病原性を示すことがわかった。
The authors sum up this paper to confirm the causal organisms of pineapple root rot wilt disease. Several species of fungi, isolated from the diseased pineapple roots, were inoculated to the pineapple plants grown in pots, trying re-appearance of the disease. Resulting of these inoculating tests, the plants, being inoculated Phytophthora cinnamomi and Phytophthora nicotianae var. parasitica in the early stage of growth, showed typical symptoms of the wilt such as the extremely shortness in the hight and discoloration of leaves, and the severe rot and great lightness in the drying weight of roots. Inoculating the both fungi to latter stage of the growth, the plants also showed the symptom of the wilt, severely in this case, such as the rapid rot of the roots as withness of the leaves. In other case, the sort of soil seems to make some differences in its causings of disease. According to our experiment, it looked occure more often in sticky Kunigami-maaji, than that of Shimajiri-maaji., As the result of these inoculating tests, another investigation of distribution before, and other tests, we conclude that, in Okinawa, the most wilt disease of pineapple is root rot wilt. And we also conclude that the main causal organisms are Phytophthora cinnamomi and Phytophthora nicotianae var. parasitica. Adding to it, we found that Pythium sp. has a slight cause of the disease.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/4143
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.26 p.17 -28
Appears in Collections:No.26 (1979/12)

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