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Powdery mildew is another prevalent disease but its often easier to live with it. As the name suggests you will actually see white powdery growth on the leaves. This can get much more prolific if your Rhododendron is grown in a damp location or somewhere very shaded. And in some situations, this happens just because of the location. It’s recommended that rhododendrons be grown in partial shade with some protection against strong winds but if it’s planted, for example, directly underneath a larger tree it can result in powdery mildew.