Two-spotted Spider Mite Tetranychus urticae. Pythium Root Rot: Lower leave wilt, leaves fall, and the plant dies. 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. Impatiens Suddenly Have White Spots On Flowers. the flowers now look like someone poured bleach on them. Answer Save. 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. Keep hose ends off the ground. As the disease progresses the plants may stop growing and look stunted, drop their leaves or completely collapse. Oidium: Apply a fungicide registered for use on impatiens. thay have white streaks and sploches all over them. Relevance. 1 of 5. Sometimes white fuzzy spots will form on the undersides of the leaves. The best way to control leaf spot is to spray a fungicide every 2 to 3 weeks. Eventually those white spots turn to a gray, powdery mess that completely destroys the petunia flowers. White spots on flowers hi, i have bright purple impatiens. they get morning sun until about 11:00am then shade for the rest of the day. Place the suspect plant in a plastic bag with a wet paper towel and leave it overnight. Impatiens > Leaves > Discolored leaves. 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. These are spores and usually appear in cool, damp weather. Sometimes, heavy gray growth develops. Spots on 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. Powdery mildew can be treated with neem oil, but you should also correct the conditions allowing this disease to get a foothold. Established impatiens crops should be scouted weekly. Look for white, powdery spots of spores that spread or cover leaves and flowers completely. (See photo on page 2.) Once the leaves developed that coating on the underside, the leaves soon dropped off and only stems were left. Pot in pasteurized, pathogen-free media. If you are growing New Guinea impatiens, and powdery mildew is present, you will find … Was is caused from the water hitting the hot flowers? Be sure to check the impatiens that are in baskets and mixed containers as they can be hard to monitor. Question From: Pinehurst, North Carolina, United States . fluffy the wonderdog. 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. Can someone explain what the white spots are on my impatiens leaves-they seem healthy otherwise.? I haven't grown impatiens since 2013. Are they preventable? Many gardeners find leaf spot to be an annual problem. 3 Answers. 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