September 16, 2025Plant Disease

First Report of Alternaria alternata Causing Leaf Spot on Parrotia subaequalis in China

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Observational analysis reveals Alternaria alternata causes severe leaf spot in Parrotia subaequalis, indicating a threat to conservation efforts.

The isolate Alternaria alternata caused severe leaf spot symptoms in Parrotia subaequalis seedlings, leading to a concerning loss in plant health.
Pathogenicity tests showed that all inoculated Parrotia subaequalis leaves developed brown spots, while controls remained unaffected, confirming the pathogen's impact.
Molecular identification techniques validated the presence of Alternaria alternata, using ITS, TEF1-α, and GAPDH gene sequences available in GenBank.
These findings highlight the need for further studies on the disease's spread and consequences for the critically endangered Parrotia subaequalis.

Yang et al. (2025) studied this question.

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Observational analysis reveals Alternaria alternata causes severe leaf spot in Parrotia subaequalis, indicating a threat to conservation efforts.