Characterization and Fungicide Sensitivity of Phaeosphaeriopsis obtusispora That Causes Marginal Leaf Blight in Agave hybrid H.11648

文献类型： 外文期刊

第一作者： Wu, Weihuai

作者： Wu, Weihuai;Wang, Guihua;Li, Erli;Tan, Shibei;Xu, Gang;Huang, Xing;Chen, Helong;Liang, Yanqiong;Li, Rui;Yi, Kexian;Wang, Guihua;Qin, Jianfeng;Yi, Kexian

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关键词： sisal; fungal disease; pathogen identification; biological characteristics

期刊名称：JOURNAL OF FUNGI （ 影响因子：4.2； 五年影响因子：4.5 ）

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年卷期： 2024 年 10 卷 7 期

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收录情况： SCI

摘要： Sisal is an important tropical cash crop in southern China. Unfortunately, it is threatened by various diseases. In 2022, a new disease tentatively named marginal leaf blight disease (MLBD) was first observed in sisal fields across Guangxi and Guangdong provinces, with an incidence rate ranging from 13% to 30%. In this work, to isolate and identify the pathogens causing MLBD, sisal leaves exhibiting the typical MLBD symptoms were collected, and nine strains were obtained. Pathogenicity tests, morphological observations, and phylogenetic analyses confirmed that two strains, namely 22GX1-3 and 22GD1-4, identified as Phaeosphaeriopsis obtusispora, were the causative pathogens of MLBD. Further investigations into the biological characteristics of P. obtusispora showed that its mycelia exhibited optimal growth on PDA medium, with the most favourable temperature and pH being 25 degrees C and 7.0, respectively. The mycelia could grow in temperatures ranging from 10 degrees C to 32 degrees C but ceased at 35 degrees C. Lactose and yeast extract powder were also identified as the optimal carbon and nitrogen sources, respectively. Additionally, the effectiveness of various control agents was assessed on a single strain, 22GX1-3. Among the twelve fungicides tested, difenoconazole was proven the most effective, with an EC50 value of 0.5045 mu g/mL. To our knowledge, this is the first report for sisal MLBD caused by P. obtusispora. Our results provide crucial pieces of information for the development of effective management strategies to control sisal MLBD caused by P. obtusispora.

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