Flowering dogwood is popular as a specimen or small grouping on residential property around homes, near patios or in lawns. Dogwood anthracnose is a fungal disease caused by the Discula destructiva. Trees should also be sprayed once in the fall after the leaves have changed color but before leaf drop. Refer to the table below for recommendations. Verticillium wilt. Even disease-resistant dogwoods may develop problems if they are planted in an unsuitable environment (full sun, drought, flooding).Research your selections prior to purchase. It typically grows 15’-30’ tall and 15’-25’ wide. When a canker completely girdles the trunk, the tree will die shortly thereafter. The symptom on the paw paw leaf looks like it might be a nutritional issue and/or possibly some sun scald -- nothing to be too concerned about. Dogwood Anthracnose, Discula destructiva, is a damaging disease that attacks various species of Dogwoods. Dark cankers will cause stem girdling and dieback. It is believed to have started in the northeastern United States about 25 years ago, but has been spreading southward ever since. Disease-resistant cultivars are available and reduce the chances of problems such as powdery mildew and spot anthracnose. These plants are relatively hardy but they do have their Achilles heels. The disease overwinters in twig and stem cankers that initiate new infections in the spring. A particular kind of canker disease called the Diffuse Canker is typical to dogwoods. The plant appears stressed especially during dry periods. Is your Dogwood tree looking wilted, spotted, and less than stellar? Other trees or multi-stemmed shrubs in the same genus as dogwood, but less commonly seen in landscapes, include cornelian cherry (Cornus mas), red osier dogwood (Cornus sericea), and bigleaf dogwood (Cornus macrophylla). The following update is … Prevent Dogwood Tree Diseases & Pests. The first symptom is small leaf spots with purple halos, which may expand to form larger tan blotches. It is popular in home and commercial landscaping because of the early spring flowers and bright red berries. Trees at Hunting Creek Lake, Cunningham Falls State Park, Thurmont, Maryland… To distinguish this disease from other leaf spots, examine the underside of the leaves (with a hand lens or magnifying glass) for numerous small tan to brown dots, about the size of a printed period, scattered within the blighted tissue. Book your reservations now When numerous, these spots can cause bracts and leaves to become wrinkled and distorted. They started looking for specimens with previously demonstrated resilience to one or both diseases. Diseased sections on twigs and small branches begin as small discolored areas with sunken or cracked bark. The fungus Discula destructiva causes dogwood anthracnose leaf blight and canker. late fall/early winter (November-December) or after the trees are finished flowering in the spring. Leaves are small or undersized and of a lighter green color and may curl. If disease symptoms are severe, especially on young trees, spraying a  fungicide labeled for this disease on dogwood is an option. Leaf scorch alone rarely kills a tree but can make it more susceptible to pests and diseases. These dots are the source of spores that will be washed away by rain or dew, or spread by insects to healthy leaves and neighboring trees. Dogwoods are low-maintenance trees but they are susceptible to some garden diseases. These dots are the source of spores that will be washed away by rain or dew, or spread by insects to healthy leaves and neighboring trees. Keep it at least 3 inches away from the trunk. Powdery mildew. The early symptoms begin in mid to late May as leaf spots with tan or purple borders. There are no chemical fungicide controls for this disease once symptoms are visible. We have all heard the fables about how even the smallest can bring down the mighty. The disease spreads from infected leaves into the twigs and branches and can cause dieback of the limbs. The fruit is eaten by fall migrant birds, gray squirrel and fox squirrel. Kousas became popular due to their disease resistance. It is popular for its exotic, bright-colored flowers. The key to maintaining the health of your dogwood is to plant it in a suitable location and take proper care of your tree to minimize stress (e.g., water during drought, avoid mulch against the trunk, etc.). Powdery Mildew: Erysiphe pulchra (formerly Microsphaera pulchra) is the fungus that attacks leaf surfaces and tender shoots and causes powdery mildew. Disease-Resistant Dogwoods Recent ... His 'Appalachian Spring' boasts as a parent the lone survivor of a wild population in Maryland's Catoctin Mountains. This fungal disease can be serious during wet spring weather. On older branches, the wood under the bark will appear dark brown in contrast to healthy light-colored wood. Although this disease is rarely serious it can cause limb dieback. Photo: Bruce Watt, University of Maine, Bugwood.org. When a canker completely girdles the trunk, the tree will die shortly thereafter. Flowering dogwood is susceptible to numerous diseases and pests, including powdery mildew (Erysiphe pulchra), dogwood anthracnose, (Discula destructiva), and spot anthracnose (Elsinoe corni). Dogwood Diseases DOGWOODS UNDER ATTACK By Bailey Walten 1990 Newsletter Our native dogwood, "CORNUS FLORIDA," is at risk from the fungus "DISCULA," an. UTIA researchers recognized the need to bring disease-resistant flowering dogwood trees to the nursery industry. Avoid this problem by planting in a location where your tree will receive partial shade and supplemental moisture during hot, dry weather. Prune out all dead or dying twigs and limbs during dry weather. Dogwoods are shallow-rooted and frequently need irrigation during the drier months of July and August. Tan splotches may develop which will kill the whole leaf. By 1983, the disease had also been found in Oregon, Idaho, and British Columbia, and the causal fungus was determined to be in the genus Discula (Salogga and Ammirati 1983). The symptoms range from a spotting of the flower bracts to a complete collapse of the bracts. Prince George's County Maryland trees and shrubs yellowing leaves dogwood horticulture submitted about 5 years ago. Dogwoods are extremely common in landscapes around the area which causes this disease to spread easily throughout landscape dogwoods and cause disfigurement of … We embody the University's land-grant mission with a commitment to eliminate hunger, preserve our natural resources, improve quality of life, and empower the next generation through world-class education. Tartarian dogwood (Cornus alba), redosier dogwood (C. sericea), and Cornelian cherry (C. mas) also are resistant to this disease. The dogwood leaves turn purple and red during the fall. Young green stems and water sprouts are especially susceptible. The dogwood leaves turn purple and red during the fall. Some of the most common are: Dogwood Anthracnose – This serious disease is difficult to control. This species is more resistant to the common dogwood disease problems. It appears as a powdery white coating on the leaves from early summer through fall. Dogwood anthracnose, caused by the fungus Discula destructiva, is a serious disease of flowering dogwoods and continues to make an impact on the vitality of landscape and forest dogwoods. Maintain a mulched, weed-free area around dogwoods to prevent injury from mowers and string trimmers. The fungus Discula destructiva causes dogwood anthracnose leaf blight and canker.. Dogwoods are poor choices for street trees because they do not tolerate heat and pollution. Photo: John Hartman, University of Kentucky, Bugwood.orgPowdery mildew (Erysiphe sp.) Call toll-free in *Maryland* at 1-877-620-8DNR (8367) Out of State: 410-260-8DNR (8367) Shade tree anthracnose. Other leaf spots appear in late summer and fall on the upper leaf surfaces but rarely cause much damage. nuttallii).). Eventually, the entire tree may show these symptoms. Common flowering dogwood pests and diseases . We also see leaf spots, leaf blight and dieback of lower branches. Apply mulch at the base of the tree to conserve moisture in the root zone. University of Maryland College Home and Garden Information Center's Integrated Pest Management Series HP #12 offers information about dogwood diseases and pests, including anthracnose. Spot anthracnose leaf symptoms on flowering dogwood. Photo: Penn State Department of Plant Pathology & Environmental Microbiology Archives, Penn State University, Bugwood.org. Photo: Florida Division of Plant Industry, Florida Department of Agriculture and Consumer Services, Bugwood.org. Tartarian dogwood. Additional Resources: Tree planting and abiotic (non-living) problems of trees.By David L. Clement, Principal Agent, University of Maryland Extension, Home and Garden Information Center, revised and edited 11/2019. The flowers and berries support native wildlife such as pollinators, birds, and small mammals. Photo: Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org, Spot anthracnose symptoms on flowering dogwood. If overhead irrigation is applied, water early to allow leaf drying before nightfall, which will minimize disease problems. It is caused by the canker fungus that spreads inside the bark, sucking-away the bark’s nutrition. This disease was first noticed in New York in the late 1970’s. One fungal infection in particular -- dogwood anthracnose or black stem disease -- can destroy dogwood trees. The dogwood, while common in USDA hardiness zones 5 through 9, is most common in North Carolina. REC, Western Maryland Central Maryland In our area, some nurseries stopped carrying native dogwoods because of the disease but then began carrying them again as the threat of disease seemed to have lessened and disease resistant varieties … Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. The early symptoms begin in mid to late May as leaf spots with tan or purple borders. Symptoms on dogwoods may also be caused by insect pests. In wet weather these spots can rapidly enlarge and kill the entire leaf. This species is more resistant to the common dogwood disease problems. This is a common disease and is not severe. Cultivars/Varieties The most common problems of flowering dogwoods in Maryland are described below. The first symptom is small leaf spots with purple halos, which may expand to form larger tan blotches. Parts of a few trees are extremely poisonous, and others are dangerous if handled improperly. In some years the powdery appearance is less evident. Bark injuries can occur when the plants are dug at the nursery, shipped or moved around within the retail sales yard. The Kousa dogwood (C. kousa), also called Chinese dogwood, has a longer bloom season and different growth characteristics and is more tolerant of dry conditions than the native flowering dogwood. Early symptoms include smaller than normal leaves, pale green leaves, and early red fall coloration, especially on individual branches along one side of the tree. A similar disease was found on western flowering dogwoods, (Corpus nuttallii Audubon) in western Washington in 1979 and named "dogwood anthracnose" (Byther and Davidson 1979). Allow proper plant spacing. Flowering dogwood (Cornus florida)is a small Maryland native tree with white or pink flower bracts in the spring, colorful foliage in the fall, and berries that support wildlife. Remove any dead leaves still attached to the branches. Dogwood anthracnose causes stem cankers and large, purple-bordered leaf spots. In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. Maintain healthy trees by irrigating during drought and avoiding over-fertilization to prevent excessive succulent growth. The early symptoms begin in mid to late May as leaf spots with tan or purple borders. They located one such species in Maryland, brought a specimen back to Tennessee, and cloned it. Dogwood Anthracnose, Discula destructiva, is a damaging disease that attacks various species of Dogwoods. It is important to note that disease-resistant does not mean immune to disease. It typically grows 15’-30’ tall and 15’-25’ wide. The springtime spectacle of dogwoods in full bloom is threatened in Maryland and throughout the East and South by an incurable, fast-spreading disease that … Registered fungicides can be utilized on trees in landscapes in the spring at bud break, followed by additional sprays every 10-14 days until leaves are fully expanded. Seiridium and Botryosphaeria canker of Leylands. Refer to, Pruning for better air circulation may help. Soon it … Photo: Paul Bachi, University of Kentucky Research and Education Center, Bugwood.org. The disease was first discovered in New York and Pennsylvania in the latter part of the 1970s and since then has been found in Maryland, West Virginia, Virginia, and reached western North Carolina. Dogwoods are prized for their hard wood, which withstands sudden hard shocks and wears smoother, not rougher, with use. Soil should be somewhat moist but not saturated. New growth is covered with a fine, white, powdery coating, typically on the upper surfaces of the leaves. Elsinoë Leaf spot (Dogwood) Fire Blight. It is resistant to the dogwood anthracnose disease, caused by the fungus Discula destructiva, unlike C. florida, which is very susceptible and commonly killed by it; for this reason, C. kousa is being widely planted as an ornamental tree in areas affected by the disease. Photo: University of Maryland Extension. If the dieback reaches the main trunk the entire tree can be killed. Leaf scorch symptoms on flowering dogwood. Older infected leaves often develop purple blotches that progress to dead areas. Bright red berries are an important food source for songbirds including evening grosbeak, cardinals, robins, cedar waxwings, and fall migrants. Since that time it slowly moved south along the Appalachian Mountains through Maryland, West Virginia and Virginia, and reached western North Carolina in 1987. In the early stages, the canker can be hard to find, but if cut into, will reveal discolored wood under the bark. It has been used for items ranging from spears and daggers to weaving shuttles, golf heads, pulleys, wedges, mallet heads, knitting needles, hog yokes, hay forks, cutting boards, mountain dulcimers, decorative pen barrels, cooking spoons, and more. The most common problems of flowering dogwoods in Maryland are described below. Even disease-resistant dogwoods may develop problems if they are planted in an unsuitable environment (full sun, drought, flooding). Plant disease-resistant cultivars of flowering dogwoods. The disease spreads from infected leaves into the twigs and branches and can cause dieback of the limbs. Select powdery mildew resistant cultivars of flowering dogwood. In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. Plant disease-resistant cultivars of flowering dogwoods. Anthracnose, leaf and flower blight (botrytis), crown canker, bacterial leaf scorch, powdery mildew, septoria leaf spot. Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. Are suitable for partially shaded locations with moist, well-drained soil. There are several hybrids between the native flowering dogwood and the non-native Kousa dogwood that exhibit better disease resistance and longer bloom periods than the native species. Flowering Dogwood (Cornus florida). REC, Lower Eastern Shore Dogwood anthracnose is caused by the Discula destructiva fungus. Under severe conditions, the dogwood fruit may become discolored and shriveled. Some dogwood varieties grow red berries during the early winter season. The fungus grows in cool, moist and shady areas. is a native forest understory tree found naturally in acidic (pH 5.5-6.5), well-drained soil in semi-shaded areas. Early symptoms include smaller than normal leaves, pale green leaves, and early red fall coloration, especially on individual branches along one side of the tree. Dogwood cankers are commonly found on the main trunk area. It is popular in home and commercial landscaping because of the early spring flowers and bright red berries. Sick Dogwood Tree District of Columbia County District of Columbia trees and shrubs disease issues dogwoods dogwood anthracnose native tree horticulture submitted about 5 years ago. Pruning for better air circulation may help. The dark spots are circular to angular in shape with purple borders and are about ¼ inch in diameter. Dogwoods are forest understory trees that grow best in partially shady sites with regular moisture and an annual application of organic matter such as leaf compost. Dogwood anthracnose, caused by the fungus Discula destructiva, was first reported in New York and Pennsylvania in the late 1970’s. Flowering dogwood (Cornus florida) is a native forest understory tree found naturally in acidic (pH 5.5-6.5), well-drained soil in semi-shaded areas. There are several damaging diseases and pests that affect dogwood trees. The leaves are opposite and elliptical, approximately 2.5 to 5 inches long and 1.5 to 2.5 inches wide, with slightly wavy edges. 580 Taylor Ave., Annapolis MD 21401. They may need irrigation during the drier months of July and August. Infections cause the loss of water and photosynthetic leaf area which weakens trees and reduces growth. Select disease-resistant dogwood cultivars to reduce the chances of problems with common dogwood diseases. REC, Dogwood Insect Pests: Identification and Management, Flowering Dogwood Trees: Selection, Care, and Management of Disease Problems, Why Are Leyland Cypress Trees Turning Brown, Azaleas and Rhododendrons: Common Diseases and Abiotic Problems, Boxwood: Preventing and Managing Common Pests and Diseases, Diagnosing Problems of Azaleas and Rhododendrons, Ornamental Fruit Trees: Preventing, Diagnosing, and Managing Problems, Tree Health and Disease-Resistant Dogwood. This is not a severe disease. Are shallow-rooted and do not compete well with turf. Photo: Cheryl Kaiser, University of Kentucky, Bugwood.org. These blighted, drooping leaves can remain hanging on the branches in wet weather before defoliation occurs. For landscaped areas, flowering dogwoods: Provide three seasons of interest, with pink or white flower bracts in the summer, red berries in summer, and attractive red to burgundy color in the fall. Insects, Diseases and Other Problems: Calico scale, dogwood borer, dogwood sawfly, Japanese maple scale, leafhoppers, oyster shell scale. Other common landscape dogwoods, such as Fungi are the main causes of dogwood tree diseases. Dogwood is a popular ornamental tree with its flowering bracts, elegant foliage, and bright red fruits. Prevent Dogwood Tree Diseases & Pests. One of the very common diseases of dogwood trees is the dogwood anthracnose which is caused by the fungus Discula sp. Are prone to several diseases for which resistant varieties are now available. Generally, no chemical controls are needed for these late-season diseases. Rake and dispose of leaves in the fall to reduce disease incidence. It causes dieback or even death of infected trees. Symptoms on dogwoods may also be caused by insect pests. Infected leaves will cling to the tree all winter instead of dropping in fall. The symptoms are characterized by numerous small (1/16 -⅛ inch) spots with purple borders. Dogwood Anthracnose. Leaf and flower blight (Botrytis sp.) For landscaped areas, flowering dogwoods: , also called Chinese dogwood, has a longer bloom season and different growth characteristics and is more tolerant of dry conditions than the native flowering dogwood. If one such part is eaten or handled, first aid is required. Dogwood anthracnose (Discula destructiva) symptoms on flowering dogwood. Eventually, the entire tree may show these symptoms. We embody the University's land-grant mission with a commitment to eliminate hunger, preserve our natural resources, improve quality of life, and empower the next generation through world-class education. Lichens Needle cast diseases. The fungus Botryosphaeria appears to be more severe on pink flowering cultivars. The initial symptoms appear as medium to large purple bordered leaf spots and scorched, tan blotches. Several bark diseases affect the dogwood. We cater Davidsonville, Stevensville and Kent Island locations. Dogwood anthracnose causes stem cankers and large, purple-bordered leaf spots. Mulch should be no more than 3 inches deep. Dogwood septoria leaf spot (Septoria cornicola). Dark cankers will cause stem girdling and dieback. On older branches, the wood under the bark will appear dark brown in contrast to healthy light-colored wood. Dogwood blight, also known as dogwood anthracnose for the fungal pathogen that causes the disease, is a fairly new problem. This fungal disease can affect both flower bracts and leaves during wet spring weather. Avoid over-application of fertilizer which can result in succulent new growth with greater susceptibility to disease. Dogwood anthracnose may spread to the twigs, larger branches, and trunk, causing dieback. Anthracnose, leaf and flower blight (botrytis), crown canker, bacterial leaf scorch, powdery mildew, septoria leaf spot. Host Plants: Dogwood anthracnose infects flowering (Cornus florida) and Pacific dogwoods (C. nuttallii). 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