Prevalence and Incidence of Sunflower Downy Mildew in North Dakota Between 2001 and 2011

Fig. 2. Sunflowers systemically infected with Plasmopara halstedii (center), resulting in severe stunting; surrounded by healthy sunflowers.



Image from Plant Health Progress article:
Prevalence and Incidence of Sunflower Downy Mildew in North Dakota Between 2001 and 2011