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Reporting
The greyish appearanceThe greyish appearance suggests downy mildrew or another fungus. The best ways to combat: spray with a fungicide (as your garden center), improve air circulation, use wider spacing when planting, avoid shade, do not water leaves with overhead sprinkling or get leaves wet (water at soil leve), and use resistant cultivars.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?