Anthracnose disease spreads very quickly and it is critical to identify it during its nascent stage. But even plants with good site conditions, annual fertilizer, and adequate water may still encounter dogwood tree problems that destroy their health and vigor. The anthracnose disease affects flowering varieties of dogwoods like the Pacific dogwood. Most of the diseases listed are seen most often on Cornus florida. These beauties burst into pink or white bloom in spring and boast bright red berries in the fall. There are any number of diseases and pests that can stress your dogwood and cause dogwood leaf drop. Dogwood Tree Bark Disease. Replant it in a location that gets full morning sun and some shade late in the day. Problems: The flowering dogwood is susceptible to many diseases and insect pests. Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. (So trading full sun for morning shade would be just as bad as what you have now, but in reverse.) It causes leaves on the tree to be smaller than normal, and the leaves might shed early. Dogwood Canker. View Map. For more information on disease and insect problems on dogwoods, refer to HGIC 2003, Dogwood Diseases & Insect Pests. Symptoms & Disease … Septoria cornicola is another fungus affecting dogwoods. Early symptoms of dogwood canker are smaller and paler leaves. It appears on dogwood leaves in late summer, with purplish, irregularly-shaped spots that have small veins radiating from the center. Other common landscape dogwoods, such as Tatarian dogwood (C. alba) and redosier dogwood (C. sericea) are also resistant to the disease. The versatile dogwood (Cornus spp.) ... Is tougher than the native flowering dogwood when it comes to disease and pests. Cornelian cherry dogwood is generally pest-free. The kousa dogwood (japanese dogwood) can be expected to grow in Hardiness Zones 5–8. Tree Type This tree is considered both a flowering tree and an ornamental tree. Leaves on infected branches are red earlier in the fall. Diseases. However, these trees are susceptible to many diseases and problems if not properly taken care of. Dogwoods need fertile, moist soil with good drainage. This disease propagates quickly in cool, slightly wet conditions that are associated with the late spring and fall season. However other dogwoods are susceptible to the diseases listed. When leaves are falling off dogwood in summer, it could mean a serious illness, improper siting or cultivation problems. Planting resistant species and cultivars is a better way to manage the disease. Dogwood canker is another disease that causes cankers on the dogwood's bark. The disease seldom kills the tree, but it distorts the leaves late in the growing season. Dogwoods are small trees that are popular additions to many landscapes in the eastern and southeastern United States. 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