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Conversely, insects with sucking mouthparts rely on partially open galls or those that naturally open to facilitate emergence. An example of the latter type is the aphid, which forms marble-sized galls on the leaf stems of cottonwood trees. While these galls have thin walls, they harbor entire colonies of aphids within.
Oak apples on Quercus robur leaf Oak galls on a Pyrenean oak (Quercus pyrenaica) in León, Spain. An oak apple on a tree in Worcestershire, England. An oak apple or oak gall is a large, round, vaguely apple-like gall commonly found on many species of oak.
Eriophyes tiliae is a mite that forms the lime nail gall or bugle gall. [2] It develops in a chemically induced gall; an erect, oblique or curved distortion rising up from the upper surface of the leaves of the lime (linden) trees (genus Tilia), such as the large-leaved lime tree Tilia platyphyllos, the common lime tree Tilia × europaea, etc.
Neuroterus saltatorius, also known as the jumping gall wasp, is a species of oak gall wasp. It is found in North America, where it induces galls on a variety of oak trees, including Oregon oak , valley oak , California scrub oak , blue oak , [ 1 ] [ 2 ] and leather oak .
The host trees are often immature or retarded specimens; galls are rarer on older, healthier trees. [3] The Turkey oak , introduced into Britain in 1735, is required for the completion of the wasp's life cycle. [4] The oak marble gall is frequently conflated with the oak apple gall, caused by another gall wasp, Biorhiza pallida.
The presence of galls on the foliage of trees is fairly common and the damage is mostly aestheticand rarely causes long-term harm to the health of affected trees, particularly mature trees, even ...
Andricus grossulariae is a gall wasp species inducing agamic acorn cup galls on oak tree acorn cups and sexual phase galls on catkins. [1] Synonyms include Andricus fructuum (Trotter, 1899), Andricus gemellus (Belizin & Maisuradze, 1961), Andricus intermedius (Tavares, 1922), Andricus mayri (Wachtl, 1879) and Cynips panteli (Kieffer, 1897).
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.