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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.
Pyemotes herfsi, also known as the oak leaf gall mite or the oak leaf itch mite, is an ectoparasitic mite identified in Europe and subsequently found in India, Asia, and the United States. The mite parasitizes a variety of insect hosts and is able to bite humans, causing red, itchy, and painful wheals (welts).
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 leaf is distorted and crumpled with folds, and is covered with reddish hairs. The reddish tinge resembles an emerging leaf, which together with the small size makes the gall easy to overlook. The mites live and feed among the hairs which are deep in the folds of the leaf and overwinter under the bud scales. [2] [3]
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 ]
The mites are resistant to chemical treatments, [2] because once symptoms are visible, the mites have already entered leaf and flower buds, which afford them protection. [5] Products that contain abamectin or spirodiclofen provide some control, [ 4 ] though repeated applications at four-day intervals may be necessary to break the mite life ...
In the autumn the mites spend the winter in old cones and bark crevices. [1] [2] This gall is found on Italian alder (Alnus cordata), European alder (Alnus glutinosa), grey alder (Alnus incana), Alnus x pubescens and Alnus viridis. [3] Similar species. A fungus, Taphrina sadebeckii, can look similar on the upper surface. [4]
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