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Triradial willow mite
Vlnovník vŕbový
Triradial willow mite
Number: 6553
Received 21.7.2025
In progress: 0 days
Date of occurrence: 16.7.2025
Significance: Less harmful
Discussion
From: Kevin
Assigned: M. Zúbrik
Country: United Kingdom

Question

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
Number of votes for this answer: 0

Pest

Triradial willow mite

Stenacis triradiatus

Triradial willow mite

Stenacis triradiatus

roztoce

Received: 21.7.2025
Wood: Willow
Number: 6553
Date of occurrence: 16.7.2025
Discussion

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