The other good ash trees are wafer ash, prickly ash and fragrant ash. Since introduction, emerald ash borer has killed millions of ash trees across the United States and threatened millions more. Note the thorns at each leaf-node as well as other random spots. As a good ash tree owner, it’s your job to determine if ash tree bark peeling is a sign of environmental problems or if the bark coming off ash trees is due to boring beetles. Within 2-3 years the tree loses the ability to conduct sap, and succumbs to the infestation. Compound leaf of Prickly Ash. The EAB is a small but powerful beetle pest–an enemy of ash trees. Once an area is infested, the cost to remove infested trees is significantly high. The Texas Ash is a perfect example of a tree native to Central Texas that has lower water needs, can tolerate plenty of heat, and makes a perfect addition to many landscapes. Mature tree trunk of Zanthoxylum clava-herculis. Unable to compete with larger trees or resist the emerald ash borer, American ash trees may be doomed to functional extinction. Wafer ash ( Ptelea trifoliata ), also called hoptree, is an excellent small tree for use from Texas to Chicago. Adult beetles feed on ash leaves and deposit eggs on the bark of their ash hosts. Dangers: Slightly toxic, do not swallow leaves or bark Medicinal Summary Bark, Leaves, Berries - oral anesthetic Bark - sweat inducer Prickly ash (Zanthoxylum clava-herculis) bark and spines. While the Emerald ash borer is found almost exclusively on ash trees, several other invasive bugs are also plaguing other types of forests across the continent. The eggs hatch and the tiny larvae penetrate the bark to feed on water conducting tissues inside the tree. Emerald ash larvae feed on the phloem and outer sapwood that lies under the bark… Ash trees make graceful landscape plants, but when your trees are stressed or plagued by pests, they may begin to shed bark in response to the damage they’re experiencing. ... Texas Tree Identification By Bark.