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