The Identification, Environmental Factors, and Fungicide Sensitivity of Colletotrichum siamense Causing Leaf Disease of Oil Palm (Elaeis guineensis) in China

文献类型： 外文期刊

第一作者： Li, Haipeng

作者： Li, Haipeng;Pang, Qiangqiang;Sun, Xiaodong;Zhou, Man;Chen, Yisong;Li, Haipeng;Wang, Zhuoying;Jiang, Changchang;Bian, Qiang;Li, Haipeng;Liu, Zhenghui

作者机构：

关键词： oil palm; Colletotrichum siamense; leaf spot disease; morphological and molecular identification; mycelial growth factors; fungicide sensitivity

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2025 年 15 卷 6 期

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收录情况： SCI

摘要： This study aimed to identify the pathogen of oil palm (Elaeis guineensis) leaf spot disease in Hainan Province, China and examine the effects of environmental factors and fungicide sensitivity on the pathogen. The research confirmed that the pathogen responsible for this novel leaf spot disease was Colletotrichum siamense, marking the first report of this pathogen on oil palm in China. Field observations revealed summer-onset disease symptoms with concomitant leaf damage. The pathogen demonstrated optimal growth at a temperature of 30 degrees C and pH of 7.0, indicating its adaptability to prevailing climatic conditions in the region. Laboratory tests assessed the effects of various environmental factors on mycelial growth, revealing a marked decline in growth at temperatures below 20 degrees C and above 35 degrees C, as well as at acidic pH levels. Fungicide sensitivity assays identified pyraclostrobin, tebuconazole, prochloraz, and carbendazim as the most effective compounds, significantly inhibiting the growth of C. siamense with low EC50 values. These findings provide essential information for developing effective disease management strategies to combat leaf spot disease in oil palm plantations.

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