Leaves of the infected impatiens plant become stippled or turn yellow, and the leaves curl downward. Ask a Question forum: Leaf curl on Impatiens or Vinca. There are many pests that can affect impatiens flowers. Sign up to get all the latest gardening tips! Windborne spores can also introduce the disease. Eventually, all the leaves and flowers will fall off leaving bare stems and the plant will die. Fremont, CA. Impatiens walleriana leaves that turn yellow, curl up and die may be infected with verticillium wilt. In your holding area, keep the plants far apart so if one is infected there is less of a chance that the disease will spread. 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. Another pest on impatiens is the tarnished plant bug, which can lead to dwarfed and deformed flowers. The powdery substance on the plant's leaves is actually spores and may occur on foliage of any age. Many gardeners find leaf spot to be an annual problem. Stem rots attack impatiens stems at or near the soil level. Powdery mildew looks like its name. Likewise, do not use overhead watering so that the leaves aren’t wet and soil won’t splash onto the leaves. Powdery mildew differs from downy mildew in the spores' appearance. A fungal disease that affects peaches and nectarines, leaf curl (Taphrina deformans) is one of the most common disease problems found in backyard orchards. Infected leaves wilt and curl up, falling from the plant before healthy leaves. Downy mildew thrives in humid or moist conditions when the weather is cool. Surrounding plants/roots should also be removed in about a 3 foot radius around the diseased plant. After your first inspection of the dying plants, you may have concluded that some animal came through and cleaned off the leaves or that a caterpillar munched off all the foliage. Impatiens Necrotic Spot Virus (INSV) can be a serious impatiens flowers disease that is brought about by thrips. During the summer, the plant may be stunted and produce less flowers. Use a fungicide such as neem or jojoba oil, horticultural oil or sulfur to kill the fungus. Left untreated, more spots will appear, causing the leaves to fall off. Since the spores can survive mild winter weather, consider replacing Impatiens walleriana with New Guinea impatiens, which is not susceptible to downy mildew. There is no practical treatment for these problems in inexpensive annual plants which die at the end of the season anyway. California Poppy Pests & Disease Problems, How to Care for Rose Bushes in Hot Weather, University of California at Davis: Verticillium Wilt, Missouri Botanical Garden: Powdery Mildew, University of California at Davis: Powdery Mildew on Ornamentals. Also, alternanthera, begonia, coleus, iresine, and torenia are all possible alternatives to impatiens. Follow label instructions carefully for proper timing and application procedures. I made sure to water them. Other impatiens problems are due to fertilization. Good spacing between plants also can help leaves to dry, so environmental conditions are not as favorable for the pathogen. Downy mildew's tree-like structures appear on stalks and the underside of leaves. It will infect standard garden impatiens, balsam impatiens, as well as native jewelweeds. Many parts of Wisconsin had quite a bit of rain this summer, making environmental conditions near-optimal in those regions. Therefore, taking preventative measures beforehand by providing appropriate conditions and being aware of the most common problems with impatiens flowers is crucial. Early symptoms of the disease include a very slight yellow-green discoloration on leaves near the tips of the branches; damage that can often be confused with spider mite feeding.
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