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The galls that form on the fruiting keys of the Ash tree are caused by the mite, Aceria fraxinivorus. These galls are irregular, woody encrustations, green at first and gradually turning to brown and black, which remain on the tree for up to two years. In Holland and France they are known as Cauliflower Galls. The mites are sap-sucking elongated cylinders, which apparently have no eyes, circulation or respiratory system and just two pairs of legs. The galls are far easier to see than the mites.
Anywhere that Ash is present.
Galls are often visible all year round.
They are mainly all female, producing eggs which need no fertilization.
Very common and widespread in Britain, although numbers seem to vary significantly depending on the number of Ash keys produced in any given year.
Common in Leicestershire and Rutland.
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