Impatiens Suddenly Have White Spots On Flowers. Sometimes white fuzzy spots will form on the undersides of the leaves. 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. Once the leaves developed that coating on the underside, the leaves soon dropped off and only stems were left. they get morning sun until about 11:00am then shade for the rest of the day. Was is caused from the water hitting the hot flowers? 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. the flowers now look like someone poured bleach on them. fluffy the wonderdog. Two-spotted Spider Mite Tetranychus urticae. White spots on flowers hi, i have bright purple impatiens. 3 Answers. Oidium: Apply a fungicide registered for use on impatiens. Relevance. Place the suspect plant in a plastic bag with a wet paper towel and leave it overnight. It is easily transmissible to other plants in the garden and thrives in wet, humid conditions. (See photo on page 2.) I haven't grown impatiens since 2013. The best way to control leaf spot is to spray a fungicide every 2 to 3 weeks. Sometimes, heavy gray growth develops. 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. Answer Save. Be sure to check the impatiens that are in baskets and mixed containers as they can be hard to monitor. These are spores and usually appear in cool, damp weather. Powdery Mildew (New Guinea impatiens) White, mealy fungal growth develops on the top of leaves. Pythium Root Rot: Lower leave wilt, leaves fall, and the plant dies. Established impatiens crops should be scouted weekly. Pot in pasteurized, pathogen-free media. Keep hose ends off the ground. Question From: Pinehurst, North Carolina, United States . Eventually those white spots turn to a gray, powdery mess that completely destroys the petunia flowers. If the plant is infected, you should see white fuzz on the underside of the leaves the next morning. 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. thay have white streaks and sploches all over them. The symptoms you have described are more typical of powdery mildew than downy mildew. When I experienced Impatiens Downy Mildew a few years ago, the back of the leaves were covered with a white substanceI don't see that in the OP's leaves. 1 of 5. Pythium spp. Powdery mildew can be treated with neem oil, but you should also correct the conditions allowing this disease to get a foothold. Look for white, powdery spots of spores that spread or cover leaves and flowers completely. 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