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Dematophora necatrix引起櫻花白紋羽病
White Root Rot of Prunus Serrulata Caused by Dematophora necatrix
摘要
櫻花白紋羽病於1994首次自武陵農場發現。罹病櫻花根部密生白色羽毛狀菌絲，根部表皮壤疽腐爛，導致地上部葉片逐漸黃化、萎凋、最後植株死亡。其病原菌經分離與鑑定證實Dematophora necatrix Hartig。將本菌菌絲培養於燕麥和小麥粒或櫻花枝條當接種源，將其接種於櫻花苗的根部，可産生與田間病株相同的病徵，且相同的病原菌也可以自接種發病的組織分離。本菌最適生長溫度爲25℃，當溫度低於10℃或高於35℃，其菌絲生長均受到抑制。分生孢子於20-30℃之間，24小時內可獲得15-30%的發芽率。
並列摘要
White root rot of prunus serrulata Lindl, caused by Dematophora necatrix Hartig was first observed at Wuling Farm, Taichung County in 1994. The diseased plants were yellowing with white plumose mycelia on and in decayed roots, and the plants eventually died. Seedlings of P. serrulata were inoculated with D necairix grown on oat-wheat grain medium of P. serrulata twig medium. After 4 months, the inoculated seedlings were dead, and the fungus was reisolated form diseased tissues. This is the first report of D. necatrix on this host. The optimum temperature for in vitro mycelial growth of D. necatrix was 25℃. Temperatures below 10℃ or above 35℃ inhibited fungal growth. Between 15% and 30% germination of conidia was obtained within 24 hr at 20-30℃.
延伸閱讀
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