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Pathogen identification and biological fungicides screening for Plumbago auriculata blight in China

Summary

A newly identified fungal disease caused by Fusarium ipomoeae is harming Plumbago auriculata plants in China. Scientists identified the pathogen using genetic analysis and tested seven plant-based treatments. They found that osthole, a natural compound, effectively controls the disease with 88% success rate, offering an environmentally friendly solution for protecting ornamental plants.

Background

Plumbago auriculata is an important ornamental plant widely used in urban landscaping. A blight disease was detected in 2023 in Wanzhou District, Chongqing, China, causing yellowing and drying of plant apexes and eventual death of aboveground parts, significantly reducing ornamental value.

Objective

To identify the pathogenic fungus causing P. auriculata blight in Wanzhou district and screen effective biological fungicides for disease control. The study aimed to provide a reference for targeted management of this newly identified disease.

Results

Isolates L9 and L11 were identified as Fusarium ipomoeae through morphological and molecular analysis. This is the first report of F. ipomoeae causing blight on P. auriculata in China. The fungus was pathogenic to Prunus serrulata and Heptapleurum arboricola. 0.4% osthole SL showed the strongest inhibitory effect with EC50 of 1.089 μg/mL and achieved 88% control efficacy in potted plants.

Conclusion

F. ipomoeae was identified as the causal agent of P. auriculata blight in China. 0.4% osthole SL is an effective biological fungicide for disease control at recommended concentration of 5.244 μg/mL. Results provide foundation for recognition and green control of this newly reported disease.
  • Published in:Frontiers in Microbiology,
  • Study Type:Experimental Study,
  • Source: PMID: 40687860, DOI: 10.3389/fmicb.2025.1609944
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