Answer: It's unusual, but not impossible, for Skimmia to develop powdery mildew. You can prune off the affected parts of the plant (after flowering has finished this spring) to remove the diseased portions and open the plant up to better air circulation, which will discourage additional attacks of fungal diseases. Since Skimmia is an evergreen, the yellowing of some of the older leaves may be a natural process. Evergreens only hold their leaves for 2-3 years, at which time the older leaves turn yellow and die, making room for healthy new leaves.
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