White Leaf Spot of Mustard Greens

While out in Livingston Parish with Kenny Sharpe earlier in the week, we visited a commercial grower having a problem with mustard greens. My first thought was downy mildew, but it turned out to be white leaf spot, caused by the fungus Pseudocercosporella capsellae.  The conidia of this fungus, which are dispersed by wind, were quite abundant on the lesions.  Cabrio (pyraclostrobin) is the only fungicide that specifically mentions this disease on the label. 

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About Don Ferrin

I am an associate professor and extension specialist in the Department of Plant Patholgy & Crop Physiology with the LSU AgCenter in Baton Rouge. I have statewide responsibility for issues and educational programs related to diseases of all horticultural crops in Louisiana.
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2 Responses to White Leaf Spot of Mustard Greens

  1. Gerard Ballanco says:

    Many of these things look alike. Was this identification by inspection or culture? Can it be distinguished from downy mildew?

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