枇杷白紋羽病及其病原菌
Other Title
White Root Rot of Loquat and Its Pathogen
Journal
中華農業研究
Journal Volume
37
Journal Issue
3
Pages
305-312
Date Issued
1988-09-09
Date
1988-09-09
Author(s)
林益昇
段中漢
Yi-Sheng Lin
Chung-Hang Duan
Abstract
枇杷白紋羽病於民國七十四年首自卓蘭發現。罹病枇杷的根部密生白色菌絲，致使葉片逐漸黃化、萎凋，最後植株死亡。病原菌經分離及鑑定後，證實為Rosellinia ( Demato - phora ) recatrix。將本菌菌絲培養於麥粒，接種在盆栽枇杷苗的根部，約經60天，可產生與田間病株相同的病徵。病原菌的子囊殼及分生孢子並未於田間發現。但將田間罹病的枇杷根置於室內黑暗且潮濕的環境下，可誘導其產生大量的子囊殼及分生孢子。分生孢子在本研究中未見其發芽，但單一子囊殼自動釋放之子囊孢子於2％水瓊脂上，却有0～35％的發芽率。本菌最適生長溫度為20～28°C，最適生長水分潛勢為0～－10bars。溫度在8°C以下，32°C以上或水分潛勢在－54bars 以下，本菌之生長完全受到抑制。
White root rot of loquat caused by Rosellinia (Dematophora) necatrix was first found in Cholan, Taiwan in 1985. The infected plants appeared leaf yellowing in the beginning and ended up wilt of the trees. Symptoms were reproduced in the greenhouse witihin 60~80 days after inoculation of the loquat plantlets with R. necatrix. The conidia and perithecia of the pathogen were not observed in the field, but, they were induced on the infected roots after they were incubated in a moist chamber under shade for months. The conidia did not germinate on water agar and potato dextrose agar. The ascospores discharged on water agar from each perithecium had 0~35% germination rate. Optimum temperature and osmotic water potential for fungal growth in vitro were 20~28 C and 0~－10 bars, respectively. Temperature below 8 C or above 32 C or osmotic water potential below －54 bars completely inhibited the fungal growth.
Publisher
農業試驗所
Type
journal article
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