Distorted and discoloured sections at the end of twigs on hawthorn bushes. They are caused by an infection, either of a fungus (rust) or an insect which has laid an egg in the plant (gall).
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Distorted and discoloured sections at the end of twigs on hawthorn bushes. They are caused by an infection, either of a fungus (rust) or an insect which has laid an egg in the plant (gall).