There are any number of diseases and pests that can stress your dogwood and cause dogwood leaf drop. The kousa dogwood (japanese dogwood) can be expected to grow in Hardiness Zones 5–8. Early symptoms of dogwood canker are smaller and paler leaves. View Map. Diseases of Dogwood Planting resistant species and cultivars is a better way to manage the disease. Dogwood Canker. Cornelian cherry dogwood is generally pest-free. Tree Type This tree is considered both a flowering tree and an ornamental tree. Leaves on infected branches are red earlier in the fall. Dogwoods need fertile, moist soil with good drainage. However, these trees are susceptible to many diseases and problems if not properly taken care of. Disease prone plants need to dry off first thing in the morning, and dogwoods do tend to get the horticultural sniffles when conditions are poor. https://www.mortonarb.org/trees-plants/tree-plant-descriptions/ For more information on disease and insect problems on dogwoods, refer to HGIC 2003, Dogwood Diseases & Insect Pests. It appears on dogwood leaves in late summer, with purplish, irregularly-shaped spots that have small veins radiating from the center. Dogwood canker is another disease that causes cankers on the dogwood's bark. Replant it in a location that gets full morning sun and some shade late in the day. The cankers eventually cover the trunk and kill the top of the tree. Not the opposite! Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. Problems: The flowering dogwood is susceptible to many diseases and insect pests. It is commonly seen on dogwoods in areas with poor drainage. Septoria cornicola is another fungus affecting dogwoods. It is normal to see leaves falling in autumn but you should not see a dogwood tree dropping leaves in summer. It causes leaves on the tree to be smaller than normal, and the leaves might shed early. Most of the diseases listed are seen most often on Cornus florida. Dogwoods are small trees that are popular additions to many landscapes in the eastern and southeastern United States. 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. ... Is tougher than the native flowering dogwood when it comes to disease and pests. (So trading full sun for morning shade would be just as bad as what you have now, but in reverse.) This disease propagates quickly in cool, slightly wet conditions that are associated with the late spring and fall season. Symptoms & Disease … Other common landscape dogwoods, such as Tatarian dogwood (C. alba) and redosier dogwood (C. sericea) are also resistant to the disease. When leaves are falling off dogwood in summer, it could mean a serious illness, improper siting or cultivation problems. Dogwood Tree Bark Disease. They are understory trees and require dappled lighting with protection from the hottest rays of the day. However other dogwoods are susceptible to the diseases listed. It is caused by the Discula fungus. The versatile dogwood (Cornus spp.) The disease seldom kills the tree, but it distorts the leaves late in the growing season. is susceptible to several problems, including diseases that attack its bark, causing varying degrees of damage. Develops a camouflage pattern of tan and brown on the trunk due to exfoliation. These beauties burst into pink or white bloom in spring and boast bright red berries in the fall. 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