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

Fig. 2. Dichotomously branched sporangiophore (A) with pyriform to fusiform sporangia (B) of onion downy mildew pathogen, Peronospora destructor.



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