Question From: Pinehurst, North Carolina, United States . they get morning sun until about 11:00am then shade for the rest of the day. Powdery mildew can be treated with neem oil, but you should also correct the conditions allowing this disease to get a foothold. Two-spotted Spider Mite Tetranychus urticae. Although we couldn't find evidence that impatiens varieties most commonly sold as bedding plants (Impatiens wallerana) are susceptible to powdery mildew, New Guinea impatiens (Impatiens hawkeri) are. Q: My impatiens are thriving, but when I watered them in the hot aftn, within 4 hours, I noticed white spots on my healthy flowers. (See photo on page 2.) Look for white, powdery spots of spores that spread or cover leaves and flowers completely. fluffy the wonderdog. I haven't grown impatiens since 2013. When I experienced Impatiens Downy Mildew a few years ago, the back of the leaves were covered with a white substance...I don't see that in the OP's leaves. Impatiens Suddenly Have White Spots On Flowers. The best way to control leaf spot is to spray a fungicide every 2 to 3 weeks. As the disease progresses the plants may stop growing and look stunted, drop their leaves or completely collapse. Answer Save. The symptoms you have described are more typical of powdery mildew than downy mildew. Pythium Root Rot: Lower leave wilt, leaves fall, and the plant dies. Place the suspect plant in a plastic bag with a wet paper towel and leave it overnight. 1 of 5. Was is caused from the water hitting the hot flowers? Pythium spp. These spots appear on my impatiens around August each year and I would like to know what causes them and if they are harmful to my plants. Sometimes, heavy gray growth develops. White spots on flowers hi, i have bright purple impatiens. Established impatiens crops should be scouted weekly. Powdery Mildew (New Guinea impatiens) White, mealy fungal growth develops on the top of leaves. Eventually those white spots turn to a gray, powdery mess that completely destroys the petunia flowers. Many gardeners find leaf spot to be an annual problem. These are spores and usually appear in cool, damp weather. Impatiens > Leaves > Discolored leaves. Spots on Leaves. thay have white streaks and sploches all over them. Brown spots on impatiens leaves, some may even have holes in the leaves, could be a sign of one of several leaf spot diseases that plague impatiens. Keep hose ends off the ground. Sometimes white fuzzy spots will form on the undersides of the leaves. If the plant is infected, you should see white fuzz on the underside of the leaves the next morning. It is easily transmissible to other plants in the garden and thrives in wet, humid conditions. Can someone explain what the white spots are on my impatiens leaves-they seem healthy otherwise.? Pot in pasteurized, pathogen-free media. Oidium: Apply a fungicide registered for use on impatiens. 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