Problems: The flowering dogwood is susceptible to many diseases and insect pests. Tree Type This tree is considered both a flowering tree and an ornamental tree. Planting resistant species and cultivars is a better way to manage the disease. Not the opposite! Dogwood Canker. The disease seldom kills the tree, but it distorts the leaves late in the growing season. The anthracnose disease affects flowering varieties of dogwoods like the Pacific dogwood. Diseases. (So trading full sun for morning shade would be just as bad as what you have now, but in reverse.) It appears on dogwood leaves in late summer, with purplish, irregularly-shaped spots that have small veins radiating from the center. View Map. 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 kousa dogwood (japanese dogwood) can be expected to grow in Hardiness Zones 5–8. 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. Early symptoms of dogwood canker are smaller and paler leaves. Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. 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. But even plants with good site conditions, annual fertilizer, and adequate water may still encounter dogwood tree problems that destroy their health and vigor. Diseases of Dogwood Leaves on infected branches are red earlier in the fall. The cankers eventually cover the trunk and kill the top of the tree. https://www.mortonarb.org/trees-plants/tree-plant-descriptions/ However, these trees are susceptible to many diseases and problems if not properly taken care of. ... Is tougher than the native flowering dogwood when it comes to disease and pests. Most of the diseases listed are seen most often on Cornus florida. Anthracnose disease spreads very quickly and it is critical to identify it during its nascent stage. Dogwood Tree Bark Disease. Dogwoods need fertile, moist soil with good drainage. For more information on disease and insect problems on dogwoods, refer to HGIC 2003, Dogwood Diseases & Insect Pests. It causes leaves on the tree to be smaller than normal, and the leaves might shed early. Some kousa dogwoods are more resistant to these pests than flowering dogwood. is susceptible to several problems, including diseases that attack its bark, causing varying degrees of damage. They are understory trees and require dappled lighting with protection from the hottest rays of the day. Other common landscape dogwoods, such as Tatarian dogwood (C. alba) and redosier dogwood (C. sericea) are also resistant to the disease. There are any number of diseases and pests that can stress your dogwood and cause dogwood leaf drop. Symptoms & Disease … It is commonly seen on dogwoods in areas with poor drainage. Septoria cornicola is another fungus affecting dogwoods. It is caused by the Discula fungus. It is normal to see leaves falling in autumn but you should not see a dogwood tree dropping leaves in summer. When leaves are falling off dogwood in summer, it could mean a serious illness, improper siting or cultivation problems. Develops a camouflage pattern of tan and brown on the trunk due to exfoliation. Dogwoods are small trees that are popular additions to many landscapes in the eastern and southeastern United States. 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