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The common spangle gall on the underside of leaves and the currant gall on the male catkins or occasionally the leaves, develop as chemically induced distortions on pedunculate oak (Quercus robur), or sessile oak (Quercus petraea) trees, caused by the cynipid wasp [1] Neuroterus quercusbaccarum which has both agamic and bisexual generations.
Eriophyes inangulis is a mite that forms the alder vein angle gall. [3] It develops in a chemically induced gall; a sub-spherical distortion rising up from the upper surface of the leaves of alder trees Alnus glutinosa along the midrib. Synonyms are Eriophyes laevis inangulis, Phytoptus laevis, and Cephaloneon pustulatum. [3]
Callirhytis perfoveata, formerly Andricus perfoveata, the leaf ball gall wasp, is a species of hymenopteran that produces leaf galls on oak trees in California in North America. [1] The wasp oviposits on coast live oak , interior live oak , and occasionally on California black oak , and induces what appears to be a roughly spherical gall ...
Amphibolips confluenta Spongy Oak Apple Gall Wasp; Amphibolips cookii Oak Apple Gall Wasp; Amphibolips nubilipennis Translucent Oak Gall Wasp; Amphibolips quercusinanis Larger Empty Oak Apple Wasp [11] Amphibolips quercusjuglans Acorn Plum Gall Wasp; Amphibolips quercusostensackenii Small Oak Apple Gall Wasp; Amphibolips quercuspomiformis Live ...
Krebs gall is caused by surface agents. Filz gall is caused by agents among surface hairs. Fold/roll gall is caused by agents within turned-over leaf blades. Pouch gall is caused by agents within a cup-like structure that occurs when opposite ends of the infected structure arch upward and form a spherical oval. Causative inside agents include:
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.
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Galls start to form as slight, rounded swelling on the tree stem, then grow to become spherical and elongate. Inside the galls are hyphae which occur in rays. Hyphae are typically found in the bark, as opposed to the wood. In the spring, aecia break through the bark covering the galls. Galls that form on branches of older pine trees cause only ...