茶輪紋葉枯病之發生及其病原菌特性與品種致病性分析

Zonate leaf blight of Camellia sinensis caused by Haradamyces foliicola

2018年2月接獲新北市文山茶區臺茶12號茶樹發生葉部病害，病斑圓形並常具有輪紋，經由田間病徵、病兆、菌株形態及分子檢測比對，確認為Haradamyces foliicola在茶樹上造成之輪紋葉枯病。病原菌於常溫保存於PDA斜面或無菌水，於一個月後活化菌絲容易變異，生長不佳；可以茶葉浸出液培養基（TIA）培養生長，但生長速度不如PDA及稻稈浸出液培養基（HAY）。於品種致病性檢定試驗中，確認以病菌繁殖體可感染臺茶12號、臺茶13號、臺茶17號、臺茶18號、臺茶19號、臺茶20號、四季春、青心大冇共8個測試品種，惟青心烏龍未產生發病情形。

"In February 2018, the authors received an unknown disease of the tea tree TTES No.12 in Wenshan Tea District. We confirm the zonate leaf bligh disease occur in Taiwan, according to the symptoms, morphological, molecular characteristics and pathogenicity test. The pathogen is not easily stored at room temperature and could be cultured on tea infusion agar medium, but the growth rate is not as good as potato dextrose agar and hay infusion agar medium. The pathogen infected 8 varieties of Camellia sinensis by propagule, expect the Chin-Shin-Oolong."