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

Fig. 4. Location of 1,558 sunflower fields in North Dakota surveyed by the mid-season survey between 2001 and 2011.



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