Jaimin S. Patel and Shouan ZhangTropical Research and Education Center, University of FloridaHomestead, Florida, U.S.A.Email: patelja@ufl.edu
Host: Ocimum basilicum L. (basil)Disease name: Downy mildewPathogen name: Peronospora belbahrii Thines
Symptoms typically appear as yellowing between the veins, although in some cases the entire leaf area becomes chlorotic. Under favorable conditions, profuse sporulation can be observed on the undersides of the leaves. The sporangia can be dispersed in splashing water or via wind currents and infect healthy basil. The disease was first identified in 1933 in Uganda and was found for the first time in the United States in 2007 in South Florida. The disease is rapidly spreading and has been identified in more than 20 U.S. states.
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