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Article

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

by
Weihuai Wu
1,*,†,
Guihua Wang
1,2,†,
Erli Li
1,†,
Shibei Tan
1,
Gang Xu
1,
Xing Huang
1,
Helong Chen
1,
Yanqiong Liang
1,
Rui Li
1,
Jianfeng Qin
3 and
Kexian Yi
1,4,*
1
Hainan Key Laboratory for Monitoring and Control of Tropical Agricultural Pests, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China
2
School of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
3
Guangxi Subtropical Crops Research Institute, Nanning 530001, China
4
Sanya Research Institute, Chinese Academy of Tropical Agricultural Sciences, Sanya 572025, China
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
J. Fungi 2024, 10(7), 486; https://doi.org/10.3390/jof10070486
Submission received: 23 May 2024 / Revised: 9 July 2024 / Accepted: 11 July 2024 / Published: 14 July 2024
(This article belongs to the Special Issue Integrated Management of Plant Fungal Diseases)
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Abstract

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 °C and 7.0, respectively. The mycelia could grow in temperatures ranging from 10 °C to 32 °C but ceased at 35 °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 µg/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.
Keywords: sisal; fungal disease; pathogen identification; biological characteristics sisal; fungal disease; pathogen identification; biological characteristics

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MDPI and ACS Style

Wu, W.; Wang, G.; Li, E.; Tan, S.; Xu, G.; Huang, X.; Chen, H.; Liang, Y.; Li, R.; Qin, J.; et al. Characterization and Fungicide Sensitivity of Phaeosphaeriopsis obtusispora That Causes Marginal Leaf Blight in Agave hybrid H.11648. J. Fungi 2024, 10, 486. https://doi.org/10.3390/jof10070486

AMA Style

Wu W, Wang G, Li E, Tan S, Xu G, Huang X, Chen H, Liang Y, Li R, Qin J, et al. Characterization and Fungicide Sensitivity of Phaeosphaeriopsis obtusispora That Causes Marginal Leaf Blight in Agave hybrid H.11648. Journal of Fungi. 2024; 10(7):486. https://doi.org/10.3390/jof10070486

Chicago/Turabian Style

Wu, Weihuai, Guihua Wang, Erli Li, Shibei Tan, Gang Xu, Xing Huang, Helong Chen, Yanqiong Liang, Rui Li, Jianfeng Qin, and et al. 2024. "Characterization and Fungicide Sensitivity of Phaeosphaeriopsis obtusispora That Causes Marginal Leaf Blight in Agave hybrid H.11648" Journal of Fungi 10, no. 7: 486. https://doi.org/10.3390/jof10070486

APA Style

Wu, W., Wang, G., Li, E., Tan, S., Xu, G., Huang, X., Chen, H., Liang, Y., Li, R., Qin, J., & Yi, K. (2024). Characterization and Fungicide Sensitivity of Phaeosphaeriopsis obtusispora That Causes Marginal Leaf Blight in Agave hybrid H.11648. Journal of Fungi, 10(7), 486. https://doi.org/10.3390/jof10070486

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