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Luobuma Leaf Spot Disease Caused by Alternaria tenuissima in China

Summary

Researchers in China identified a serious fungal disease affecting Luobuma plants (used for tea, medicine, and textiles) caused by the fungus Alternaria tenuissima. The disease caused leaf spots that spread rapidly, with infection rates reaching 95% in some plants. Testing showed that a fungicide called hymexazol was effective at controlling the disease, offering farmers a practical solution for protecting their crops.

Background

Luobuma (Apocynum venetum and Poacynum hendersonni) is widely cultivated in China for environmental conservation, medicinal purposes, and textile industry. In 2018, a severe leaf spot disease was observed on Luobuma plants in Yuzhong County, Gansu Province, China, causing significant damage to the crop.

Objective

To identify the fungal pathogen causing leaf spot disease on Luobuma species and evaluate the effectiveness of hymexazol and zhongshengmycin fungicides against the pathogen in vitro.

Results

The causative agent was identified as Alternaria tenuissima based on molecular and morphological analysis. Disease incidence reached 94.33% in A. venetum and 77.78% in P. hendersonni. Hymexazol fungicide demonstrated superior antifungal activity with an EC50 of 151.75 mg/L, significantly more effective than zhongshengmycin.

Conclusion

This is the first report of A. tenuissima causing leaf spot disease on Luobuma in China. Hymexazol fungicide is effective for controlling the disease. Further research is needed to develop comprehensive control strategies for this severe foliar disease.
  • Published in:Journal of Fungi (Basel),
  • Study Type:Pathology Study,
  • Source: PMID: 37998868, DOI: 10.3390/jof9111062
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