![]() ![]() In particularly high humidity environments, you may see a lavender-colored fuzz on the underside of the leaf. The spots will eventually turn brown and combine to make large spots. You’ll first notice pale or yellowing lesions along the leaf veins of your plant. New infections can occur during warm weather months due to spores being carried on air currents or overwintered in hoop houses or greenhouses. In climates with a hard, killing freeze in the winter, downy mildew spore survival is low and overwintering impossible. ![]() Yes, the pale or yellow leaf spots on an infected leaf will eventually merge together and turn the entire leaf brown. With downy mildew, you’ll see rapid leaf death, especially during wet and humid periods. Downy mildew can be very harmful to plant health. Powdery mildew looks bad but rarely kills the plant.Powdery mildew has a white or gray tint to the entire leaf, whereas downy mildew starts off as pale or yellow splotches on the tops of leaves, with a purplish fuzz on the underside of the leaf. ![]()
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