Disease Du Jour (August 25)

Today’s photos are of Cercospora leaf spot of persimmon and come courtesy of Stuart Gauthier in Vermillion Parish. The disease occurs only on the foliage and does not affect the fruit directly. However, it can cause premature defoliation, which in turn can affect the ripening fo the fruit and the production of next year’s fruiting wood. Copper fungicides are the only fungicides labeled for control of this disease that are readily available to homeowners, but it’s a bit too late to control it now.  Azoxystrobin (Heritage and Abound) are also labeled for this use, but are a bit too expensive for most homeowners.  One of the best management options available at this time is to do a good job of sanitation this fall and get rid of fallen leaves that will serve as a source of inoculum. Late spring and summer applications of copper should give reasonable control next year. 

Cercospora leaf spot on persimmon.

 

Cercospora leaf spot on persimmon.

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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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