About Aceria fraxinivora (Nalepa, 1909)
Aceria fraxinivora (Nalepa, 1909) has two common names: the cauliflower gall mite and the ash key gall. This mite causes abnormal growths called galls that develop on the hanging winged seeds (known as "keys") of ash trees belonging to the genus Fraxinus. The gall it produces, called the ash key gall, is widespread across Britain, and its population changes from year to year in line with fluctuations in annual ash seed production. In France and the Netherlands, this gall is known as the cauliflower gall.
