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Mary Hausbeck Plant Pathology In the past week, downy mildew has been found on cucumbers in four new counties, Montcalm, Huron, Oceana and Newago. Figure 1. Confirmed Downy Mildew Reports in Michigan as of August 19, 2009 Table 1. Downy mildew spore trap daily totals (counts/m3/day) by location (Click to see table.) Table 2. Fungicide recommendations