An Epidemic of Downy Mildew caused by <i>Peronospora destructor</i> on Vidalia Sweet Onions in Georgia in 2012

Fig. 1. Symptoms of onion leaves (cvs. Sweet Carolina and Sapelo Sweet) infected by the downy mildew pathogen: (B) tip dieback.



Image from Plant Health Progress article:
An Epidemic of Downy Mildew caused by Peronospora destructor on Vidalia Sweet Onions in Georgia in 2012