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tree located in spacious domestic garden with multiple shoots in upper canopy effected leading to some crown thinning
Answer
Hi Kevin, the damage you see on the willow is caused by Stenacis triradiatus, also known as the triradial willow mite. This microscopic mite creates characteristic galls and dense, twisted clusters of shoots called witches’ brooms. It overwinters under bud scales and becomes active in spring, feeding on young shoots, leaves, and catkins.
If you have any further questions, feel free to ask.
Best regards,Milan Zubrik