This spring my neighbor saw one of these balls as we walked our dogs. The bracket will darken after several weeks, before turning black and cracked but remaining on the tree for a year or more. Symptoms: Dulling of leaf color, loss of vigor, leaves turn yellow or brown, leaves wilt. Oak Wilt: The wilting of oak tree results from infection of fungus. Lichens are not dangerous, but something could be wrong with your tree. Conk is yet another fungus that can attack the oak tree as well as a large number of ornamental trees. Wounds provide the entryway for this disease, and the fungus can kill the sapwood or cause white rot of the sapwood. The leaves start to turning yellow and wilt as the disease progresses. Oak Bracket (Inonotus dryadeus) Description: Annual bracket ranging from 10-70cm across. Instead, contact a certified arborist to diagnose what is wrong with your tree. The adult female wasp lays single eggs in developing leaf buds. If you do have a lichen, don't try to remove it. Fortunately, you can get rid of oak galls in a few simple steps. 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. He said they were tree galls and, when decorated with art, they made good Christmas decorations. Water and nutrient supply required for growth of this plant is blocked. Discoloration of the leaves of oak tree is the first observed symptom. Oak apple or oak gall is the common name for a large, round, vaguely apple-like gall commonly found on many species of oak.Oak apples range in size from 2 to 4 centimetres (1 to 2 in) in diameter and are caused by chemicals injected by the larva of certain kinds of gall wasp in the family Cynipidae. The flesh is reddish brown, hard and fibrous. Oak Apple Galls Large, 1- to 3-inch applelike growths that are hard to the touch, oak apple galls usually develop on the petioles -- stems -- or midribs of oak leaves. Galls usually don't cause lasting harm, but heavy infestations can be fatal. You may think you have oak trees with moss fungus in your yard, but most likely, it's a lichen. In the worst cases, when left untreated trees can become structurally unsafe and uproot or snap possibly causing property damage and injury. 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. Also known as Oak root fungus, is a disease caused by the fungi of the genus Armillaria. Inside the spongy gall tissue is a single wasp larva protected by a hard seedlike cell. It is also known as Ganoderma applanatum. The fungus attacks vascular system of the oak tree. Pale when young, usually with droplets of clear to brownish liquid that seep from tubes on top. These little balls, called oak galls, are a common occurrence caused when the tree reacts to non-stinging wasps laying their eggs on its leaves, branches, twigs or flowers. This one was tan in color. If left untreated it will cause rapid decline and death. The large, light-colored balls on oak trees are "oak apples," harmless galls that protect a single wasp larva inside.
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