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