These are the biggest insect galls found in the western United States. Horned oak galls are unsightly, golf ball-size woody growths on oak twigs caused by a tiny wasp (Callirhytis comigera).The name refers to the characteristic horns that protrude from the surface of the mature galls. The wasp was intentionally introduced from the Mediterranean in the 1800s because its galls have a high tannin content, which was useful for tanning leather and dyeing cloth. Oak marble gall. Both of these woody twigs galls on oak look similar, but the horned oak gall has small horns that protrude from around the circumference of the gall (Figs. Jumping Oak Gall. One adult gall wasp … Inside the gall, there are a number of chambers, each housing a larva which eats its way out. One wasp lives inside each gall; the wasp's activiy may make the gall "jump" several inches off the ground. These larvae cause the oak tree to manufacture cells and substances that produce the gall and in turn the wasp larvae use the gall as both food and shelter. Gouty oak gall wasps emerge from the stem galls in winter. Oak gall wasp – there are hundreds of different gall wasp species within the Cynipidae family that infect one or all oak tree species. Oak marble galls are caused by another gall wasp, this time Andricus kollari. The galls develop over the winter and can be seen in March and April. Galls of the asexual generation are spherical, 1/8 to 1 inch in diameter, and appear on branches and twigs of live oak in late summer and early fall. The gouty oak gall wasp, C. quercuspunctata, develops in the twigs of pin, scarlet, red, and black oaks. The marble gall is a species of wasp which lay their eggs to mature on twigs of scrub oak. Marble galls only contain the larvae of one female wasp, which then lays its eggs in the buds of the Turkey oak. The generation-specific galls are different in size and general appearance. The gall then serves as a protective shell in which the wasp larvae can grow and feed, Dill said. Marble Gall. Sevin (carbaryl) pesticide is labeled for gall wasp … These round, seed-like galls fall off leaves when mature. Oak galls come in many sizes, shapes and colors but are all products of the oak trees' reaction to the larvae of certain wasps known as gall wasps. Cynipid gall wasps on oak- Bassettia ligni, Andricus californicus, Besbicus mirabilis, and Neuroterus saltatorius There are several cynipid gall wasps that make galls on oaks in the PNW. Many of the wasps from leaves and succulent stem gall emerge in late spring or early summer. Caused by a small wasp, they typically appear on the leaves of valley oak and California white oak. The California Gall Wasp. Oak apple gall information tells us that galls are formed when a female oak apple gall wasp lays eggs in the central vein on an oak leaves. One potentially damaging cynipid gall wasp in nursery production is Bassettia ligni , a native insect that causes twig galls on Oregon white oaks. It causes one of the most common galls on live oak. The California gall wasp, Andricus quercuscalifornicus, produces the large, round oak apple galls frequently observed on valley oak. When the larvae hatch, chemical and hormone interaction between the wasp eggs and the oak causes the tree to grow the round gall. The life cycle of this wasp and the galls it produces are illustrated below (Figures 1 and 2). Adults emerge in June and July. 2. These galls can be found between May and June where the female has laid her eggs in the leaf bud. In the case of the fuzzy orange galls, these growths look like tiny balls of fluff. Chestnut gall wasp – infects young branch shoots, flower buds and leaf buds. The marble gall is found on pendunculate oaks. Gall wasp on trees. 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