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

Fig. 1. Plasmopara halstedii sporulation on the underside of an infected sunflower leaf.



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