Ash Flower Gall Mite

Aceria fraxiniflora, the ash flower gall mite, is a species of gall mite that produces galls on ash trees. The male flowers of ash are greatly distorted by the mites, which results in a highly disfigured and disorganized gall that remains yellow or green, and later dries and turns brown. However, there is little evidence that this injury has a substantial impact on the ash plant's health.