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首页> 美国卫生研究院文献>Gates Foundation Open Access >Distribution of Pseudocercospora species causing Sigatoka leaf diseases of banana in Uganda and Tanzania
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Distribution of Pseudocercospora species causing Sigatoka leaf diseases of banana in Uganda and Tanzania

机译：在乌干达和坦桑尼亚造成香蕉Sigatoka叶片病的假尾孢菌物​​种分布

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Sigatoka leaf diseases are a major constraint to banana production. A survey was conducted in Tanzania and Uganda to assess the distribution of species and severity of Sigatoka leaf diseases. species were identified using species‐specific primers. Sigatoka‐like leaf diseases were observed in all farms and on all cultivars, but disease severity varied significantly (  P. fijiensis, the causal agent of black Sigatoka, was the only pathogen associated with Sigatoka disease. was associated with Sigatoka‐like symptoms in Kilimanjaro region. Black Sigatoka disease was more severe in Uganda, with a mean disease severity index (DSI) of 37.5%, than in Tanzania (DSI = 19.9%). In Uganda, black Sigatoka disease was equally severe in Luwero district (mean DSI = 40.4%) and Mbarara district (mean DSI = 37.9%). In Tanzania, black Sigatoka was most severe in Kagera region (mean DSI = 29.2%) and least in Mbeya region (mean DSI = 11.5%). , the most devastating sigatoka pathogen, was detected at altitudes of up to 1877 m a.s.l. This range expansion of , previously confined to altitudes lower than 1350 m a.s.l. in East Africa, is of concern, especially for smallholder banana farmers growing the susceptible East African Highland bananas (EAHB). Among the banana varieties sampled, the EAHB, FHIA hybrids and Mchare were the most susceptible. Here, the loss of resistance in Yangambi KM5, a banana variety previously resistant to .  , is reported for the first time.
机译：剑叶病是香蕉生产的主要制约因素。在坦桑尼亚和乌干达进行了一项调查，以评估Sigatoka叶片疾病的种类分布和严重程度。使用物种特异性引物鉴定物种。在所有农场和所有品种中均观察到类似Sigatoka的叶病，但疾病严重程度差异很大（黑色Sigatoka的病原体斐济疟原虫是唯一与Sigatoka病相关的病原体。乌干达的黑色Sigatoka疾病更为严重，平均疾病严重性指数（DSI）为坦桑尼亚的平均严重程度指数（DSI = 19.9％）。乌干达的卢沃罗地区的黑色Sigatoka疾病也同样严重（平均DSI = 40.4％）和Mbarara区（平均DSI = 37.9％）。在坦桑尼亚，黑色Sigatoka在Kagera地区最为严重（平均DSI = 29.2％），而在姆贝亚地区最少（平均DSI = 11.5％）。病原体在海拔高达1877 m.asl的地方被检测到。这种范围的扩大（以前仅限于东非的海拔低于1350 m.asl）引起了人们的关注，特别是对于种植易感的东非高地香蕉（EAHB）的小农香蕉种植者而言。一个在抽样的香蕉品种中，EAHB，FHIA杂种和Mchare最易感染。在这里，扬比亚比KM5（先前对香蕉具有抗性的香蕉品种）的抗性丧失。 ，是首次报告。

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