Our native flowering dogwood is a magnificent tree, and some homeowners will settle for nothing else. Good air circulation is necessary to hasten drying of leaves after rainfall and to lower the risk of disease. Even in winter, this tree has an appeal all its own with bark that resembles a jigsaw puzzle. This disease is common in Arkansas, especially following frequent rainfall and cool temperatures in April and May. It must be well-drained. Ornamental Features: Each species brings its own value to the landscape. There are a number of Kousa dogwood varieties, and the only basic difference is how each tree looks. It most frequently attacks trees that are stressed or injured. To head off fungal diseases, plant dogwood trees with enough space between them and other plants so that air can circulate around the tree. angustata) flowering in early June in Upstate South Carolina. Most are creamy white; some will turn pinkish with age. In spring, it produces a heavenly array of star-like blooms. The first parts of the tree to be affected are the flower bracts (petals). Red edible fruit appear in July. Fall color will be more intense with a greater exposure to sunlight. Crown canker, Phytophthora cactorum, is the most serious disease of flowering dogwoods in the Eastern United States. A million members, donors, and partners support our programs to make our world greener and healthier. Native to Asia. Dogwood Anthracnose… It can also be used in containers. Provides great fall color, with leaves turning purple and scarlet. The larvae (young insects) resemble caterpillars and feed on the foliage of several species of dogwood and are most commonly seen on shrub dogwoods [e.g., silky dogwood (Cornus amomum), redosier dogwood (C. … Fall leaf color is varies from purple to red to yellow. If you’re interested in the meaning behind common tree names, this one may underwhelm. The fall leaf color is red to reddish-purple, although those sited in full shade may have poor fall color. Fruit could cause some litter problems. But last summer's hot and dry weather kept anthracnose problems to a minimum. Mulch will encourage root growth and provide moisture retention. Other common landscape dogwoods, such as “Kousa” is apparently the Japanese word for dogwood. Kousa dogwood is indigenous to East Asia. Dogwood Tree Bark Disease. This tree is considered both a flowering tree and an ornamental tree. And your symptoms don't match. However, there are many other beautiful dogwoods to choose from that are much more resistant to insects and disease. Resistant to the anthracnose (Discula) that is common on flowering dogwood. The kousa dogwood grows to a height of 15-25' and a spread of around 25' at maturity. It is sometimes referred to as the Chinese dogwood. Dogwood anthracnose is one of the most common fungal diseases to attack this plant. Also, there is a subspecies of kousa dogwood, Cornus kousa var. Both flowering and Kousa dogwood are susceptible to this disease, although resistant cultivars of both species have been identified. Joey Williamson, ©HGIC, Clemson Extension. Disease Management Site selection Dogwoods grow as understory trees in the forest and prefer partly shaded locations. All recommendations are for South Carolina conditions and may not apply to other areas. The following actions help: Immediately cut off infested branches; Remove fallen leaves; Prevention includes keeping the soil moist and mulching it … However, do not place the mulch directly against the trunk. Burpee Natural & Organic Azalea, Camellia & Rhododendron Granular Plant Food (4-3-4), Miracle Gro Nature’s Care Evergreen & Shrub Plant Food (3-3-6), C. Stellar Pink® Stellar® series (‘Rutgan’). Bright red, flowering dogwood (Cornus florida) fruit are eaten by migrating birds in the late fall. Disease, pest, and problem resistance. Leaves on infected branches are red earlier in the fall. If the disease is a common problem in your area, it is best to choose a cultivar with powdery mildew resistance. The showy fruit are pinkish-red to red, and appear in September and October. Identification of taxa of kousa dogwood and related hybrids with greater resistance to dogwood anthracnose would provide information for selecting disease resistant dogwoods for planting in areas where the disease is prevalent. Yes, dogwoods have recently been under attack from some troublesome insect pests and diseases. Kousa dogwood seeds are eaten by squirrels and birds. The fungus is killing tree-type dogwoods in the wild. To reduce the chance of trunk damage, and thus insect and disease incidence, provide mulch beneath the canopy of dogwoods. Dogwood borer. Fungi thrive in cool, wet weather and prevention is the best cure. Cornus kousa, commonly called Kousa dogwood, is a small, deciduous flowering tree or multi-stemmed shrub that typically grows 15-30’ tall, with a vase-shaped habit in the early years but eventually maturing to a more rounded form.Bloom occurs in late spring. Dogwood anthracnose is the most common disease that affects dogwood trees. Pacific dogwood is unlikely to be killed, but may be defoliated, while Kousa is mostly resistant. Spores are spread by wind to surrounding dogwoo… The Cornus kousa (Korean Dogwood or just Kousa) tree is more resistant to diseases that plague other dogwoods.It thrives in zones 5-9. Evergreen kousa dogwood (Cornus kousa var. Synonyms are Benthamia kousa and Cynoxylon kousa. When dogwood diseases call for fungicides, copper-based sprays handle infections well. Leaves on infected branches are red earlier in the fall. The following dogwoods are among those recommended for their tolerance or resistance to disease. Fall is the best time to plant. Do not prune when leaves or twigs are wet. Kousa dogwood is resistant to many insects and diseases that afflict other dogwoods. Root Development. Noteworthy Characteristics. Flowering dogwood (Cornus florida) and the Kousa dogwood (Cornus kousa). It is not a common allergen. Cornus kousa (Kousa Dogwood) is a small, deciduous flowering tree or multi-stemmed shrub with 4 seasons of interest. Dogwood anthracnose. Has a beautiful form with horizontal branching. For USDA zones 5 to 8. This tree may be more adaptable to soil conditions than flowering dogwood. Kousa Dogwood Tree - Cornus Kousa is a Lovely Flowering Ornamental Tree. Kousa dogwood is resistant to many insects and diseases that afflict other dogwoods. Joey Williamson, ©2011 HGIC, Clemson Extension. They grow in clusters, and if not discovered by birds and other wildlife, can persist on the tree until December. Develops a camouflage pattern of tan and brown on the trunk due to exfoliation. Seed Propagation. Deeply planted or drought/heat stressed trees may be attacked by the clearwing moth ‘dogwood … It is caused by the canker fungus that spreads inside the bark, sucking-away the bark’s nutrition. Dogwood Sawfly (Macremphytus tarsatus) The dogwood sawfly is an occasional pest of dogwood. Tan splotches may develop which will kill the whole leaf. In the landscape, the disease can be kept in check with fungicides. Resistance to anthracnose and powdery mildew, two diseases that often plague flowering dogwoods. Mature Height/Spread: The Cornelian cherry dogwood will grow 20 to 25 feet tall and 15 to 20 feet wide. Millie Davenport, ©2015 HGIC, Clemson Extension. Dogwoods are small trees that are popular additions to many landscapes in the eastern and southeastern United States. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 1010 | Updated: Jan 3, 2020 | Print, Flowering dogwood (Cornus florida) bloom. Japanese Kousa dogwood blooms are like a starry night sky. Pacific dogwood (Cornus nuttallii) is very susceptible. It is not tolerant of extended drought. Plant a decline-resistant kousa dogwood (Cornus kousa) instead. Complete, acid-forming organic fertilizers are also excellent choices for use on dogwoods, for spring and early summer fertilization. Yes, dogwood trees are prone to anthracnose, a fungus that affects many plants, especially in damp, wet seasons. The kousa dogwood grows in acidic, loamy, moist, sandy, well-drained and clay soils. The spring blooms are probably the tree’s largest selling point — and its most misunderstood. Powdery mildew (Erysiphe pulchra and Phyllactinia guttata) will distort new foliage and coat the leaves with white fungal growth that often desiccates the leaves and causes leaf drop on flowering dogwood. For more information on disease and insect problems on dogwoods, refer to HGIC 2003, Dogwood Diseases & Insect Pests. Lower branches may be removed to make a small tree. Early symptoms of dogwood canker are smaller and paler leaves. Examples of organic fertilizers are: Dogwoods do not tolerate extremely wet or dry soils, and should be watered deeply (1 to 2 inches per week) during dry periods, especially if located in the sun. It is a small deciduous tree 8–12 m tall, native to eastern Asia. This white, powdery growth is common on dogwood leaves and twig tips. Landscape Use: Kousa dogwood is best used as a border accent, near a deck or patio, or as a specimen. Prune out affected stems and leaves and destroy the plant material. Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. When stressed, is susceptible to a large number of disease problems, most serious is dogwood anthracnose. The naturally occurring variety, C. kousa var. The disease appears to affect more North American native species than non-native dogwoods such as the kousa dogwood. Choose a site for the Cornelian cherry dogwood that has full sun or partial shade. In autumn, it offers spectacular bright red color. Joey Williamson, ©HGIC, Clemson Extension. However other dogwoods are susceptible to the diseases listed. It infects and kills the leaves and young shoots of some North American Cornus species (dogwoods). Ornamental Features: The “flowers” (bracts) of the kousa dogwood appear after leaves emerge in spring, several weeks, Red colored kousa dogwood (Cornus kousa) fruit in autumn. Leaves on infected branches are red earlier in the fall. The height ranges from 15 to 20 feet tall (flowering dogwood in the sun) to 40 feet tall (flowering dogwood in the shade). Mature Height/Spread: The height and spread varies depending on the species and its location in the landscape. It grows 20 feet tall and 15 feet wide and blooms in late winter with bright yellow flowers. Prevent Dogwood Tree Diseases & Pests. chinensis has been quite susceptible in some studies). The tree also makes a visual contribution year-round. A mature tree should have a 2- to 3-inch deep ring of mulch at least 8 to 10 feet in diameter around the tree. Growth Rate: A slow to moderate grower, it will grow 20 feet in 25 years. It will grow in a variety of soil types but prefers moist, fertile, well-drained soil. Dogwood trees are widely known for their delicate beauty, and the kousa variety adds a toughness that makes this species an excellent choice for home landscapes and urban areas. These beauties burst into pink or white bloom in spring and boast bright red berries in the fall. chinensis, is native to China, and varies slightly from the species with slightly larger floral bracts, fruit, and leaves. dogwood (Cornus kousa). Is a good choice for planting near utility lines, buildings or walls. Landscape Use: Each of these species is recommended for use in screens, as a border accent, near a deck or patio, or as a specimen. 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