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Because of their tiny size, these mites are able to enter the male flower structure before it appears visibly open. This disease is characterized by the formation of galls caused by insects or mites. This gall is caused by a small mite that causes irregular distortion of male flowers. Although present every year, this gall is particularly numerous this year. Gall mites cause the tissues in plant’s hairs to develop improperly. Ash flower gall is caused by the eriophyid mite, Eriophyes fraxiniflora. Ash Flower Gall and Mites. Gall mites are extremely tiny plant feeders, often around 0.5mm in size. They are unsightly and remain on the tree over the winter. The larvae emerge and begin feeding on male flowers, creating galls. This is commonly seen on the leaves of maple trees. The ash (Fraxinus spp.) Ash Flower Gall Mite and Catkingall Mite Eriophyes fraxiniflora; ... Ash Flower Gall Mite. This feeding causes the formation of groups of galls surrounded by a fringe of disfigured leaves. This small mite feeds on the male flower buds, causing them to develop abnormally. The mite is difficult to manage once it moves into the blister-like domiciles it creates by feeding on the leaf tissue in the early spring. Trying to control the mite after the galls begin to develop will not be effective. Ash flower gall does not harm the health of a tree, but in some years will make a tree look unsightly. Pear leaf blister mite. When the larvae hatch from the eggs of the insect, the oak mites feed on it. The tree responds to this feeding by growing around the feeding insect and as a result the flowers enlarge. The formation of leaf galls requires a good deal of energy and nutrients from the tree, as it tries to defend and heal itself. Pear and apple leaves are often the chosen targets of rust mites. After overwintering near buds, the mites attack the male flowers as they are opening in the spring. In the spring, the females move to developing male flower buds and deposit their eggs. Gall mites cause ash flower gall, maple bladder gall, spindle galls on maple and linden, velvet galls on maple, along with many other plants. During the late summer the galls turn dark brown and woody, and can remain on the tree for more than one season. Galls on ash tree formed by ash flowergall mites are more of an interesting nuisance than a real threat, as they do not harm the tree at all. fuchsia gall mite spruce spider mite. The mites feed in the flower clusters making them become irregularly branched and fringed. The galls really do not hurt the tree. Oak mites live inside these galls on the oak trees. ASH FLOWER GALL. Green ash is commonly attacked by a small mite that feeds on the male flowers in the spring. Last week our forestry specialist sent the image shown here with questions about it’s possible cause. The galls in turn provide some protection for the mite against weather, predators and parasites. If you live in the eastern half of the US, Ash Flower Galls do far less damage than the found on the flowers of male ash trees; swollen masses of fused male flowers remain green throughout the growing; season; brown, lumpy galls are noticed after leaf drop and are present from year to year; Cottonwood Catkingall Mite . Galls are abnormal plant growths that look like green or brown clusters formed on the branches. Once the gall starts growing it is too late to , treat the plant. Pear leaf blister mite, Eriophyes (=Phytoptus) pyri, is an eriophyid mite found on pear, Pyrus sp. For trees with extreme infestations, preventative treatments in very early spring to control overwintering mites – as they begin feeding on the expanding leaves but before the galls have enclosed them – may reduce the incidence of galls but are generally of limited value. Control. Common galls caused by eriophyid mites include ash flower gall. 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