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Aceria ilicis causes felt-like galls (erinea), which are a patch of glandular hairs, caused by gall mites of the family Eriophyoidea. The bulge is 2–3 mm high on the upperside of the leaf of holm oak (also known as evergreen oak) and the depression below is several mm wide; there are usually several on a leaf.
Eriophyidae is a family of more than 200 genera of mites, which live as plant parasites, commonly causing galls or other damage to the plant tissues and hence known as gall mites. About 3,600 species have been described, but this is probably less than 10% of the actual number existing in this poorly researched family.
The mite itself is microscopic. However, it is visible through the gall that it produces. Unlike its close relative, the maple bladder-gall mite, the galls produced by the maple spindle gall mite are not rounded, but rather elongate. While unsightly to some, they do not cause major damage to the maple trees themselves, and don't often distort ...
Aceria is a genus of mites belonging to the family Eriophyidae, the gall mites.These tiny animals are parasites of plants.Several species can cause blistering and galls, including erineum galls. [1]
Eriophyes is a genus of mite that forms galls, mainly on the leaves of deciduous plants. Some are called blister mites. The blue butterfly Celastrina serotina has been reported to feed on these galls and also on the mites, making it one of the uncommon carnivorous Lepidoptera. [1] Whereas other mites have four paired legs, Eriophyes have only ...
The mite usually attacks the flower clusters soon after they open. The individual gall is no more than 2 cm across but when grouped together can be impressive as they present a sizable irregular deformity formed from the fused and swollen flower stalks . [5] The gall has also been found on buds, leaf stalks, twigs or trunks.
Aceria chondrillae [1] (chondrilla gall mite, skeletonweed gall mite) is a gall-forming deuterogynous eriophyid mite. It is often used as a biological control of the noxious weed Chondrilla juncea (rush skeletonweed), [ 2 ] a highly competitive herbaceous perennial composite found in Europe, Asia, Australia and North America.
Typically, galls are 2–3 millimetres (0.079–0.118 in) in diameter, and may be numerous on the upper surfaces of leaves. [1] They have an opening in the lower surface. At first they are yellowish-green or bright red, later they become dark red and black. [2] In Britain, the mite affects introduced silver maple.