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Choysia with white bits under leaves
Anyone know the name of a disease of white stuff on underside of leaves. Pic attached.
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That looks like an attack of Hydrangea Scale Insects ... there seems to be a lot of it about this year
https://www.rhs.org.uk/advice/profile?PID=557
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.