Sweet Orange Scab Now in Louisiana

On August 20, sweet orange scab (SOS), caused by Elsinoë australis, was confirmed on a residential citrus (lime) tree in the Algiers section of Orleans Parish.  According to USDA-APHIS PPQ, “under the International Plant Protection Convention standards, Elsinoë australis is considered to be a pest that is transient, actionable, and under surveillance”. While this disease is not as devastating as huanglongbing (greening), it’s establishment and continued presence in the state will require that those growing oranges will need to spray to control it.

Sweet orange scab on satsuma.


Citrus scab on satsuma.



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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