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Plant Disease (2022) 106, p. 1525 (Xu et al.)

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Y.Y. Xu, J.T. Zhang, M. Xu, D.M. Liu, J.P. Ding, D.L. Pei and Q.C. Hong (2022)
First report of powdery mildew caused by Golovinomyces monardae on scarlet beebalm (Monarda didyma) in China
Plant Disease 106 (5), 1525-1525
Abstract: During 2021, ornamental scarlet beebalm plants (Monarda didyma) grown in Henan Province, China were observed with powdery mildew symptoms. These appeared initially as nearly circular, small, white, powdery mildew-like spots on the leaves that gradually expanded, covering entire leaves. The lesions spread from lower leaves to the upper canopy, and the stems were also covered by white mycelia. In severe cases, early defoliation occurred. About 30% of plants were affected. The fungus Golovinomyces monardae was found on the diseased plants. The identification was based on morphological characteristics and DNA sequence analysis. Pathogenicity of the isolates was demonstrated by inoculation.
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Golovinomyces monardae Monarda (crop) China (NE)