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The hatching larvae nourish themselves with the nutritive tissue of the galls, in which they are otherwise well-protected from external environmental effects. The host plants, and the size and shape of the galls are specific to the majority of gall wasps, with about 70% of the known species parasitizing various types of oak, inducing oak galls ...
Callirhytis seminator, the wool sower, is a species of gall wasp in the family Cynipidae. [1] The adult wasps are about 1/8" in length and dark brown in color. The larvae are white and fat and have no legs. The wasps only lay eggs on white oak trees and only in the spring. They lay the egg in a gall, a round, white structure resembling a cotton ...
The gall itself is a typical oak apple gall in appearance, roughly spherical and varies from greenish to reddish or orange depending on host, age and environmental conditions. The galls range in size from a 2–14 cm across and often contain multiple larvae as well as parasites and other species that form a mutual relationship by feeding off ...
Andricus foecundatrix (formerly Andricus fecundator) is a parthenogenetic gall wasp which lays a single egg within a leaf bud, using its ovipositor, to produce a gall known as an oak artichoke gall, oak hop gall, larch-cone gall or hop strobile [1] [2] The gall develops as a chemically induced distortion of leaf axillary or terminal buds on pedunculate oak (Quercus robur) or sessile oak ...
The asexual generation gall consists of an inner capsule of mature galls with a woolly covering, typically appearing on the underside of leaves along the mid-vein. A mature gall measures 1.0–7.0 mm in diameter and 2–3 mm high. The woolly covering varies from creamy white to yellowish-white when older, and the inner capsule is light brown.
Andricus quercusstrobilanus, the lobed oak gall wasp, is a species [1] of gall wasp in the family Cynipidae, [2] found in North America. [3] The quercus in its specific name is the genus name for oak, while "strobilus" is derived from the Greek strobilo which means "cone", a reference to the cone shape of the gall; [4] thus the gall is sometimes called pine cone oak gall.
Biorhiza pallida, also known as the oak apple gall wasp, [1] is a gall wasp species in the family Cynipidae. This species is a member of the tribe Cynipini: the oak gall wasp tribe. Cynipini is the tribe partially responsible for the formation of galls known as oak apples on oak trees. These are formed after the wasp lays eggs inside the leaf ...
Galls (upper left and right) formed on acorns on the branch of a pedunculate (or English) oak tree by the parthenogenetic generation Andricus quercuscalicis.. The large 2 cm gall growth appears as a mass of green to yellowish-green, ridged, and at first sticky plant tissue on the bud of the oak, that breaks out as the gall between the cup and the acorn.