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

Summary

Researchers in China identified a fungal disease affecting Plumbago auriculata (cape leadwort), a popular ornamental plant. The disease was caused by Fusarium ipomoeae, a fungus that causes yellowing and death of plant tissue. Scientists tested seven biological pesticides and found that osthole, a natural compound, was most effective at controlling the fungus and preventing disease.

Background

Plumbago auriculata is an important ornamental horticultural plant widely used in urban landscaping. In 2023, a blight disease was first detected in Wanzhou District, Chongqing, China, seriously reducing the ornamental value of the plants. The pathogenic fungus and effective control measures needed to be identified.

Objective

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

Results

Isolates L9 and L11 were identified as Fusarium ipomoeae through phylogenetic analysis, representing the first report of F. ipomoeae causing blight on P. auriculata in China. The pathogen showed pathogenicity to Prunus serrulata and Heptapleurum arboricola. 0.4% osthole SL showed the most significant inhibitory effect with an EC50 value of 1.089 μg/mL and achieved 88% control efficacy in potted plant experiments.

Conclusion

F. ipomoeae was identified as the causal agent of P. auriculata blight in Wanzhou District, Chongqing. 0.4% osthole SL biological fungicide proved effective for disease control with an optimal application concentration of 5.244 μg/mL. The results provide a foundation for recognition and green control of P. auriculata blight.
  • Published in:Frontiers in Microbiology,
  • Study Type:Experimental Research Study,
  • Source: PMID: 40687860, DOI: 10.3389/fmicb.2025.1609944
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