Plant Disease (2022) 106, p. 1532 (Fulcher et al.)

Michael R. Fulcher and Paul C. Owen-Smith (2022)
First report of Erysiphe cruciferarum causing powdery mildew of Alliaria petiolata in Maryland
Plant Disease 106 (5), 1532-1532
Abstract: During 2021, invasive Alliaria petiolata plants growing in Maryland, U.S.A. were observed with powdery mildew symptoms, including white, tomentose mycelium producing abundant conidia. A majority of plants were affected, and severity ranged from the presence of small, discrete infections to complete colonization of leaves, stems, and ripening seed pods. The fungus Erysiphe cruciferarum was isolated from 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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Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Alliaria petiolata (weed)		U.S.A. (NE)
Erysiphe cruciferarum (weed pathogen)	Alliaria petiolata (weed)		U.S.A. (NE)