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APSnet Image of the Week
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Downy mildew (Peronospora parasitica) on shepherd’s-purse (Capsella bursa-pastoris)
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Light micrograph (400×) of oogonia and antheridia of downy mildew (Peronospora parasitica) in tissues of shepherd’s-purse (Capsella bursa-pastoris)
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Light micrograph (400×) of sporangiophore and sporangia of downy mildew
(Peronospora parasitica) in tissues of shepherd’s-purse (Capsella
bursa-pastoris)
Photographs courtesy Drake C. Stenger
USDA-ARS, 344 Keim Hall
University of Nebraska, Lincoln 68583
Background: Both the weed host and the pathogen are common during May and June on disturbed sites in and around DeKalb, IL. Morphologically identical pathovars occur in various crop and weed crucifers. The pathogen often occurs in mixed infections with white rust (Albugo candida).
APS publication number: IW00003
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