Gerberas can get white (or gray) powdery mildew; if it gets advanced, it can devastate the plants. I tried to find some photos to see if you can ID and confirm whether this is your issue. Try here (click under diseases on the white mildew first): http://gerbera.org/” class=”bbcode_url”> http://gerbera.org/
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.