Most common galls. Several species of gall-making psyllids infest hackberry trees. It emerges from the soil in the spring and lays its eggs in the leaf tissue on the undersides of leaves. Leaves of hackberry trees often have the hackberry nipple gall, caused by an insect called a psyllid. Note: destroy the infected galls either by burning or by “baking” in a tied black bag set to warm up hot in the sun. Most leaf galls on oak are not damaging. Eyespot galls are caused by a gall midge that rarely causes injury. Range from slight swelling to large knot-like growth. Appear as leaf curls, blisters, nipples or erineums (hairy, felt-like growths). However, an application of carbaryl (Sevin) at bud break may reduce infestations of some galls. Learn more here. Stem and twig galls. Formed on leaf blades or petioles. Two common species of twig gall-producing insects are the horned oak gall wasp, Callirhytis cornigera , and the gouty oak gall wasp, C. quercuspunctata . However, twig or branch galls may cause injury or even death to a heavily infested tree. This irregular gall looks like rooster's combs on the leaves. In the case of leaf gall, simply pluck the leaf off. Don’t compost the materials directly. Most leaf galls on oak cause little or no harm to the health of a tree. As the larva grows, the leaf tissue surrounding it swells slightly and the plant develops red and yellow rings around the gall. On the upper or lower leaf surface. Many rust fungi induce gall formation, including western gall rust, which infects a variety of pine trees and cedar-apple rust.Galls are often seen in Millettia pinnata leaves and fruits. Insect galls are often so host-specific, they can give you six-legs up on tree identification. Making a correct tree identification is the critical first step in correctly diagnosing a tree problem. It develops a small pocket that surrounds the insect, forming a "gall" (photo above). The psyllid spends the rest of the summer sucking on tree sap safely within the small gall. Leaf galls rarely affect tree health so control is rarely justified. After the egg hatches, the young psyllid starts feeding, and the leaf responds by growing abnormally. Jumping oak gall caused by cynipid gall wasps Leaf galls. It is difficult to spray moderate to large trees without special equipment and the necessary protective clothing to protect the applicator from spray drift. Commonly seen galls on oak include the following: Oak apple galls are attached to the oak leaf as round light-green balls up to 2 inches in … Deformed growth on stems and twigs. Willow tree galls are unusual growths that appear on willow trees. Artificial control for gall … Leaf galls may not appear again the following season, but twig and stem galls will more than likely remain on the tree. 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