Cause Erysiphe begoniicola (formerly Microsphaera begoniae), this fungus needs … I moved a month ago and it seems to have triggered powdery mildew for the first time in keeping begonia in 3 years. Most diseases, however, are the direct result of cultivation deficiencies. ... Be sure not to get the leaves damp in the process, though, as this can lead to fungal diseases like stem rot or powdery mildew. WeeNel Ayrshire Scotland, United Kingdom Oct 10, 2008. Powdery Mildew: White, mealy fungal growth develops on leaves, flowers, and stems. I've tried propagating my begonia … Just as any other houseplant, the angel wing begonia can also be susceptible to various diseases and pests. Spray the natural fungicide spray onto the begonia plants at the first sign of powdery mildew. Bookmark. Jay W. Pscheidt, 2009. Angel wing begonias have large, “angel wing… Quote. Subtle, light colored colonies can be seen on the large leaf in the center. It can fall victim to fungal diseases, including powdery mildew, stem rot, and botrytis if it isn’t looked after properly. The leaves and flowers of begonia plants grow out of these joints. In the winter (or if you are keeping your Angel Wing Begonia … The Angel Wing Begonia was named for its foliage, which is shaped like the wings of angels. You will need to try keep moisture … Angel Wing begonia plants, first found in South America, make up a large portion of the cane begonia group. This house doesn't have the light the last one did so I've supplemented with grow lights. … Oidium: Examine plants carefully and frequently to detect the onset of disease. Here is what powdery mildew looks like on a cane begonia leaf. Reapply the fungicide spray to the begonia plants once each week to control the powdery mildew and prevent it from spreading. To avoid these diseases, ensure your Angel Wing … Cover the leaves, stems and blossoms thoroughly with the liquid. 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