What is an "identification key?" Hello, I have a couple willow oaks exhibiting poor leaf growth. All Rights Reserved. Diseases Affecting Live Oak Trees. The disease infects the interior of tree and causes the decay of its sapwood. Ceratocystis fagacearum , commonly called oak wilt, is a fungus that affects oak trees, especially in the central and eastern United States. Even though not much is known about the cause of burls, it should be assumed that proper tree management that improves tree health can help reduce the occurrence of burls or make their presence less of a problem. Durham Co., NC 5/3/08. White oak group (bottom image): Leaves have rounded lobes (when present) and lack a bristle at the tips of both leaves and lobes. They are in the red oak group but do not have the characteristic lobed leaves of the red oaks. The discolored foliage will begin at the top of the willow oak and work its way down, branch by branch. While taking Willow Oak care, its diseases should be taken into consideration as it affects the health of the plant. Symptoms of oak tree diseases include discolored or spotted foliage, dead or dying foliage or branches, thinning canopy, shelf mushrooms or wet patches on the trunk. Pests Examples: post oak, bur oak, chestnut oak, chinkapin oak,swamp chestnut oak, overcup oak and live oak. Willow Oak Leaf, Scientific Name: Quercus phellos. While taking Willow Oak care, its diseases should be taken into consideration as it affects the health of the plant. The High Plains/Midwest AG Journal explains that trees should be removed and destroyed if 15 percent or more of the tree’s crown displays symptoms of infection. Oak wilt affects both red and white oaks but is more common in red oaks. The willow oak tree is a fast-growing tree that can reach mature heights up to 75 feet. Willow Oak is one of the most familiar large trees in North Carolina. The acorn crop begins at about 15 years of age and continues as the tree matures. It takes full sun or light shade and needs a well-drained soil, preferably rich and on the acid side. Growing willow oak trees is easy and very rewarding. Common Oak Tree Diseases. Willow Tree Care and Diseases Willow Tree Care, Pruning & Disease Prevention. Missouri Botanical Garden: Quercus Phellos, University of Minnesota Extension: Oak Anthracnose, University of Rhode Island Landscape Horticulture Program: Oak Leaf Blister, Texas A&M Agrilife Extension: Hypoxylon Canker and Oaks, Tree Diseases With Prematurely Falling Leaves. Plan the perfect garden with our interactive tool →, willow-tree about river image by Maria Brzostowska from Fotolia.com, High Plains/Midwest AG Journal: Hypoxylon Canker of Oaks, University of Florida: Quercus Phellos Willow Oak. Key to Oak Diseases. Examples: post oak, bur oak, chestnut oak, chinkapin oak,swamp chestnut oak, overcup oak and live oak. This disease can be prevented with an annual fungicidal treatment that is applied in the early spring, just before the onset of the growing season. The infected willow oak will experience discolored foliage, premature defoliation, growth stunt and overall loss of vigor. OAK TREE DISEASES Anthracnose (fungus ‐ Gloeosporium sp. It might be decaying of its roots, infecting leaves, causing yellowish color, mushy spots and holes or infecting its stem. As little as 1 inch of fill soil can kill an oak. The blister-like patches re… Many homeowners don't realize that their actions can contribute to a tree dying, so it is important not to make any changes to the canopy of an oak tree. Many homeowners don't realize that their actions can contribute to a tree dying, so it is important not to make any changes to the canopy of an oak tree. There is no cure for armillaria root rot and the infected trunk, including the stump, should be removed. Knowing about these will help you identify and treat the symptoms in a timely manner, so that you do not lose the tree. The appearance of these growths indicates severe trunk rot and decay. The severely infected oak will also develop creamy white fungal growths on and around the base of the tree. Writing professionally since 2004, Charmayne Smith focuses on corporate materials such as training manuals, business plans, grant applications and technical manuals. There are several species responsible for powdery mildew, but they all exhibit roughly the same signs. diseases such as oak wilt. Willow Oak is easy to grow in acidic, average, medium to wet, well-drained soils in full sun to light shade. Find a plant. Comments: Willow Oak falls into the red oak group, and shares many of the same traits as Red Oak (Quercus rubra). Oak (Quercus) is a versatile plant that provides shade, acts as a windbreak and produces acorns, which, in turn, feed wildlife. Anthracnose. Willow oaks are susceptible to oak wilt and chestnut blight, as well as cankers such as hypoxylon canker and blisters such as oak leaf blister. Bryce E. Schlaegel. The … ): Anthracnose is more common on white oak group (Bur Oak, Over Cup Oak, White Oak and Post Oak) than on the other more common oaks. Willow scab causes cankers to form, which are areas of cracked, dead wood. Live oak trees are susceptible to a number of diseases like root and butt rot, mistletoe, wilt, etc. This soil-borne fungal disease attacks the willow oak through its root system. Although unsightly, oak leaf blister will not cause permanent injury to the willow oak tree. Spores of the fungus overwinter on the bud scales and infect emerging leaves when conditions are conducive to disease development. Maintaining healthy oak trees, by following recommended cultural practices, is the first line of defense in preventing most of these problems. Durham Co., NC 5/3/08. are beautiful. The leaves make great landscape mulch and are not as apt to smother the lawn as other oaks if one is tardy about raking the leaves in the fall. Black canker: this is a serious willow tree disease that is caused by the black canker fungus in combination with the willow scab fungus. Willow oak is a tough tree well adapted to urban conditions, but can develop chlorosis of high pH soils so be sure to plant on only acid or neutral soil. Oak Leaf Blister: Oak leaf blister is a disease caused by the fungus Taphrina caerulescens. The Tree Atlas . The willow oak tree is a fast-growing tree that can reach mature heights up to 75 feet. It affects oaks in a manner similar to how dutch elm disease affects elms. Fairly disease and pest resistant. Willow scab can sometimes occur with black canker. Examples: blackjack oak, laurel oak, pin oak, scarlet oak, shingle oak, Shumard oak, water oak, and willow oak. 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