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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 reproduction of gall wasps is usually partly parthenogenesis, in which a male is completely unnecessary, and partly two-sex propagation. [2] Most species have alternating generations, with one two-sex generation and one parthenogenic generation annually, whereas some species produce very few males and reproduce only by parthenogenesis, [2] possibly because of infection of the females ...
Atrusca trimaculosa, also known as the woollybear gall wasp, is a species of gall wasp. [2] [3] This wasp is found on a variety of oak trees, including valley oak, blue oak, and Oregon oak. Its galls are 3–4 mm wide, round, and covered in stiff hairs. The galls are located on leaves, and often clustered together.
Andricus quercuslanigera Wool-bearing Gall Wasp; Andricus quercuspetiolicola Oak Petiole Gall Wasp; Antistrophus chrysothamni yellow rabbitbrush;
Callirhytis quercusoperator (Osten Sacken, 1862) - Woolly catkin gall wasp; Callirhytis quercuspunctata (Bassett, 1863) - Gouty oak gall wasp; Callirhytis quercussuttoni (Ashmead, 1885) - Gouty stem gall wasp; Callirhytis quercusventricosa Bassett, 1864; Callirhytis quinqueseptum (Ashmead, 1885) [12] Callirhytis rubida Weld, 1921; Callirhytis ...
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.
The wasp oviposits on shrub live oak and Gambel oak leaves. [1] The larval chamber is at the center of the gall, connected to the husk by slender, radiating fibers. [1] This wasp is most commonly observed in the American Southwest, as far north as Denver. [2] It is visually similar to, and may be confused with, Atrusca bella. [1]
Dryocosmus dubiosus is an abundant species of cynipid wasp that produces galls on oak trees in California in North America. [1] [2] Commonly known as the two-horned gall wasp, the wasp oviposits on the leaves and catkins of coast live oaks and interior live oaks. [1] After the eggs hatch, the resulting gall form looks like it has a set of bull ...