Elsinoë Leaf spot (Dogwood) Fire Blight. Bark injuries can occur when the plants are dug at the nursery, shipped or moved around within the retail sales yard. The disease spreads from infected leaves into the twigs and branches and can cause dieback of the limbs. It is popular for its exotic, bright-colored flowers. Dogwood Anthracnose, Discula destructiva, is a damaging disease that attacks various species of Dogwoods. Powdery mildew. As the canker enlarges it will form a sunken area on the trunk and the bark will dry and crack, exposing the wood underneath. It causes dieback or even death of infected trees. Varieties, hybrids and cultivars Common flowering dogwood pests and diseases . REC, Western Maryland Other leaf spots appear in late summer and fall on the upper leaf surfaces but rarely cause much damage. The early symptoms begin in mid to late May as leaf spots with tan or purple borders. Branch canker on red twig dogwood. Fall foliage is a showy red color. Dogwood anthracnose is a fungal disease caused by the Discula destructiva. Photo: Chris Evans, University of Illinois, Bugwood.org, Growing DogwoodTree Health and Disease-Resistant DogwoodDiagnosing and Managing Dogwood Diseases. We also see leaf spots, leaf blight and dieback of lower branches. Dogwoods are extremely common in landscapes around the area which causes this disease to spread easily throughout landscape dogwoods and cause disfigurement of foliage each year. Photo: John Hartman, University of Kentucky, Bugwood.org. Dogwood Diseases. The early symptoms begin in mid to late May as leaf spots with tan or purple borders. Dogwood Diseases DOGWOODS UNDER ATTACK By Bailey Walten 1990 Newsletter Our native dogwood, "CORNUS FLORIDA," is at risk from the fungus "DISCULA," an. This practice can introduce the disease into a neighborhood that was previously disease-free. A fungal disease named dogwood anthracnose was sickening and ultimately killing the flowering dogwoods in Maryland’s Catoctin Mountain Park. In fact, they don't have any major diseases. If the dieback reaches the main trunk the entire tree can be killed. 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. In some years the powdery appearance is less evident. 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. Some cultivars exhibit characteristics that may or may not be desirable to you or wildlife (e.g., double flowers, lack of berries). They located one such species in Maryland, brought a specimen back to Tennessee, and cloned it. Fungi are the main causes of dogwood tree diseases. Avoid this problem by planting in a location where your tree will receive partial shade and supplemental moisture during hot, dry weather. Flowering dogwood, when stressed by poorly drained soils or fully exposed locations with limited moisture , is susceptible to a rather large number of insect and disease problems, the most serious of which is dogwood anthracnose. There are no chemical fungicide controls for this disease once symptoms are visible. If one such part is eaten or handled, first aid is required. 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. By 1987, dogwood anthracnose had been reported in over 60 counties in 8 Northeastern States -- Connecticut, Maryland, Massachusetts, New Jersey, New York, Pennsylvania, Virginia, and West Virginia. Place susceptible plants where there is adequate sunlight and good air circulation to reduce humidity levels. The dogwood leaves turn purple and red during the fall. One fungal infection in particular -- dogwood anthracnose or black stem disease -- can destroy dogwood trees. 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. Refer to our page on dogwood pests. 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. Viruses. Dogwood anthracnose may spread to the twigs, larger branches, and trunk, causing dieback. Dogwood cankers are commonly found on the main trunk area. 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. This is true with a host of fungal and bacterial diseases of dogwood or tiny insects that may infect or infest your dogwood tree. Leaf and flower blight (Botrytis sp.) If disease symptoms are severe, especially on young trees, spraying a  fungicide labeled for this disease on dogwood is an option. Refer to, Pruning for better air circulation may help. symptoms on flowering dogwood. These blighted, drooping leaves can remain hanging on the branches in wet weather before defoliation occurs. In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. The flowers and berries support native wildlife such as pollinators, birds, and small mammals. Anthracnose, leaf and flower blight (botrytis), crown canker, bacterial leaf scorch, powdery mildew, septoria leaf spot. Dogwood anthracnose, caused by the fungus Discula destructiva, was first reported in New York and Pennsylvania in the late 1970’s. The symptoms range from a spotting of the flower bracts to a complete collapse of the bracts. Photo: Mary Ann Hansen, Virginia Polytechnic Institute and State University, Bugwood.org, Spot anthracnose symptoms on flowering dogwood. Young green stems and water sprouts are especially susceptible. 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. Rake and dispose of leaves in the fall to reduce disease incidence. Symptoms on dogwoods may also be caused by insect pests. The first symptom is small leaf spots with purple halos, which may expand to form larger tan blotches. They are not tolerant of full sun, hot and dry,  poorly drained sites, or flooding. 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. The disease overwinters in twig and stem cankers that initiate new infections in the spring. is a native forest understory tree found naturally in acidic (pH 5.5-6.5), well-drained soil in semi-shaded areas. Select powdery mildew resistant cultivars of flowering dogwood. 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). Tan splotches may develop which will kill the whole leaf. Central Maryland All water sprouts or suckers on trunks and branches should also be removed. The following update is … Plant disease-resistant cultivars of flowering dogwoods. Pruning for better air circulation may help. Infected leaves will cling to the tree all winter instead of dropping in fall. Dogwood anthracnose (Discula destructiva) symptoms on flowering dogwood. The fungus Discula destructiva causes dogwood anthracnose leaf blight and canker. This disease was first noticed in New York in the late 1970’s. They may need irrigation during the drier months of July and August. Powdery mildew on flowering dogwood. Witches' Broom: Wood rots and decay Plant disease-resistant cultivars of flowering dogwoods. This species is more resistant to the common dogwood disease problems. It typically grows 15’-30’ tall and 15’-25’ wide. Drought-stressed dogwoods are particularly prone to disease problems. Dogwood Anthracnose is a disease caused by the fungus Discula destructiva that attacks native and ornamental flowering dogwood trees. 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 … Causes. The rough bark is a reddish-brown color. on flowering dogwood. Shade tree anthracnose. 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. 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. There are several damaging diseases and pests that affect dogwood trees. 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). When a canker completely girdles the trunk, the tree will die shortly thereafter. This fungal disease can weaken and even kill a dogwood over time. Parts of a few trees are extremely poisonous, and others are dangerous if handled improperly. Dogwood anthracnose causes stem cankers and large, purple-bordered leaf spots. Photo: Florida Division of Plant Industry, Florida Department of Agriculture and Consumer Services, Bugwood.org. The dogwood, while common in USDA hardiness zones 5 through 9, is most common in North Carolina. It is believed to have started in the northeastern United States about 25 years ago, but has been spreading southward ever since. These blighted, drooping leaves can remain hanging on the branches in wet weather before defoliation occurs. If the dieback reaches the main trunk the entire tree can be killed.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. Dogwood anthracnose is caused by the Discula destructiva fungus. Dogwood Anthracnose. Lichens Needle cast diseases. Eventually, the entire tree may show these symptoms. As the canker enlarges it will form a sunken area on the trunk and the bark will dry and crack, exposing the wood underneath. 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. Dogwood is a popular ornamental tree with its flowering bracts, elegant foliage, and bright red fruits. It is important to note that disease-resistant does not mean immune to disease. 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). UTIA researchers recognized the need to bring disease-resistant flowering dogwood trees to the nursery industry. Dogwood Anthracnose Dutch Elm Disease . In the fall, rake and remove fallen leaves. Keep it at least 3 inches away from the trunk. Infected bracts eventually become covered with a gray fuzzy growth of fungus. 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. This occurs when the amount of water leaving the plant (transpiration) exceeds the amount of water uptake by the roots. Management: Generally, no chemical controls are needed for this disease because drier weather will stop disease progression before serious damage occurs. Bright red berries are an important food source for songbirds including evening grosbeak, cardinals, robins, cedar waxwings, and fall migrants. 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. Refer to Diagnosing Problems of Flowering Dogwood for a chart of symptoms and possible causes. 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 … Infections cause the loss of water and photosynthetic leaf area which weakens trees and reduces growth. The first symptom is small leaf spots with purple halos, which may expand to form larger tan blotches. Eventually, the entire tree may show these symptoms. Refer to our pages about tree planting and after-planting care. REC, Lower Eastern Shore Is your Dogwood tree looking wilted, spotted, and less than stellar? Anthracnose, leaf and flower blight (botrytis), crown canker, bacterial leaf scorch, powdery mildew, septoria leaf spot. Trees should also be sprayed once in the fall after the leaves have changed color but before leaf drop. Maintain a mulched, weed-free area around dogwoods to prevent injury from mowers and string trimmers. Occasionally, very small black dots are visible inside these spots that indicate where the infectious spores are formed. In the early stages, the canker can be hard to find, but if cut into, will reveal discolored wood under the bark. Central Maryland Dogwoods are poor choices for street trees because they do not tolerate heat and pollution. The fruit is eaten by fall migrant birds, gray squirrel and fox squirrel. Powdery mildew (Erysiphe and Phyllactinia guttata) has become a more severe and widespread problem in recent years. Remove any dead leaves still attached to the branches. 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. Prince George's County Maryland trees and shrubs yellowing leaves dogwood horticulture submitted about 5 years ago. Crown canker, Phytophthora cactorum, is the most serious disease of flowering dogwoods in the Eastern United States. Flowering Dogwood (Cornus florida). Even disease-resistant dogwoods may develop problems if they are planted in an unsuitable environment (full sun, drought, flooding). Wilt Diseases. Book your reservations now It wasn’t detected in Maryland until 1983, but judging from the existing damage to trees and its wide distribution across the state, the disease had most likely been in the state for a few years. For a time in the mid-Atlantic, native dogwoods were particularly prone to anthracnose, a fungal disease affecting native dogwoods. 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.). It is important to note that disease-resistant does not mean immune to disease. The dogwood leaves turn purple and red during the fall. Refer to the table below for recommendations. 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. 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. Some of the most common are: Dogwood Anthracnose – This serious disease is difficult to control. Avoid digging native trees from the woods and transplanting them into landscapes. Tartarian dogwood (Cornus alba), redosier dogwood (C. sericea), and Cornelian cherry (C. mas) also are resistant to this disease. When a canker completely girdles the trunk, the tree will die shortly thereafter. Dogwood anthracnose causes stem cankers and large, purple-bordered leaf spots. Select disease-resistant dogwood cultivars to reduce the chances of problems with common dogwood diseases. Characteristics: The Flowering Dogwood is a relatively small tree, reaching heights of 30 feet and trunk diameters of 8 inches. Mulch should be no more than 3 inches deep. Dogwoods are extremely common in landscapes around the area which causes this disease to spread easily throughout landscape dogwoods and cause disfigurement of … On older branches, the wood under the bark will appear dark brown in contrast to healthy light-colored wood. Spray at bud break in the spring, followed by additional sprays every two weeks as needed throughout the season. Root rot of trees & shrubs Rust diseases : Scab on apple. Soil should be somewhat moist but not saturated. Dogwood septoria leaf spot (Septoria cornicola). In wet weather, these spots can rapidly enlarge and kill the entire leaf. In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. The fungus grows in cool, moist and shady areas. Dogwood anthracnose is a fungal disease caused by the Discula destructiva. Are prone to several diseases for which resistant varieties are now available. Trees that are stressed due to unsuitable cultural and environmental conditions are more susceptible to diseases and pest problems. Do not replant dogwood trees in the same spot that a diseased tree was growing. This serious disease of dogwoods usually results from an injury to the bark near the base of the trunk that is invaded by this fungus-like organism called a water mold. One of the very common diseases of dogwood trees is the dogwood anthracnose which is caused by the fungus Discula sp. Treatment in landscape situations is rarely necessary. 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. It appears as a powdery white coating on the leaves from early summer through fall. Verticillium wilt. Oregon State University Extension's Online Guide to Plant Disease Control describes cultural controls for … Some cultivars exhibit characteristics that may or may not be desirable to you or wildlife (e.g., double flowers, lack of berries). It causes dieback or even death of infected trees. 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. Scorch symptoms include browning along leaf edges and a dropping or wilted appearance. Dogwoods are low-maintenance trees but they are susceptible to some garden diseases. 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. Prevent Dogwood Tree Diseases & Pests. Management: Avoid buying trees with wounded bark. The initial symptoms appear as medium to large purple bordered leaf spots and scorched, tan blotches. In wet weather, these spots can rapidly enlarge and kill the entire leaf. Plant cultivars that are resistant to spot anthracnose. Flowering dogwood is popular as a specimen or small grouping on residential property around homes, near patios or in lawns. Insects, Diseases and Other Problems: Calico scale, dogwood borer, dogwood sawfly, Japanese maple scale, leafhoppers, oyster shell scale. It is popular in home and commercial landscaping because of the early spring flowers and bright red berries. Dogwood Anthracnose, Discula destructiva, is a damaging disease that attacks various species of Dogwoods. Host Plants: Dogwood anthracnose infects flowering (Cornus florida) and Pacific dogwoods (C. Kousas became popular due to their disease resistance. Leaf scorch is a symptom of drought-stressed trees. Young green stems and water sprouts are especially susceptible. The fungus Botryosphaeria appears to be more severe on pink flowering cultivars. 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. If overhead irrigation is applied, water early to allow leaf drying before nightfall. Under severe conditions, the new leaves can exhibit leaf scorch, twisting, distortion, and smaller than normal growth. Disease-Resistant Dogwoods Recent ... His 'Appalachian Spring' boasts as a parent the lone survivor of a wild population in Maryland's Catoctin Mountains. Dogwood Acres is the Annapolis area's best pet care facility provider for Doggie Daycare, Dog Training, Cat Boarding & Grooming services. 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. On older branches, the wood under the bark will appear dark brown in contrast to healthy light-colored wood. Allow proper plant spacing. Infected bracts that fall onto leaves can also cause leaf and twig infections. If so, it may be suffering from Dogwood Anthracnose. Pruning of dogwoods can be done in late fall/early winter (November-December) or after the trees are finished flowering in the spring. Some of the most common are: Dogwood Anthracnose – This serious disease is difficult to control. Refer to the table below for recommendations. Tan splotches may develop which will kill the whole leaf. Soon it … Fungicides will not cure visible symptoms. Infected leaves exhibit marginal leaf scorch, dead patches, reddish discoloration, yellowing and premature defoliation. Research your selections prior to purchase. This fungal disease can weaken and even kill a dogwood over time. 1 Dogwood anthracnose. Avoid over-application of fertilizer which can result in succulent new growth with greater susceptibility to disease. Call toll-free in *Maryland* at 1-877-620-8DNR (8367) Out of State: 410-260-8DNR (8367) This fungal disease can affect both flower bracts and leaves during wet spring weather. The dogwood tree is commonly grown for ornamental purposes, often as a standalone tree. Are suitable for partially shaded locations with moist, well-drained soil. 580 Taylor Ave., Annapolis MD 21401. It is popular in home and commercial landscaping because of the early spring flowers and bright red berries. Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. Photo: Bruce Watt, University of Maine, Bugwood.org. Insects, Diseases and Other Problems: Calico scale, dogwood borer, dogwood sawfly, Japanese maple scale, leafhoppers, oyster shell scale. This species is more resistant to the common dogwood disease problems. Dark cankers will cause stem girdling and dieback. Symptoms on dogwoods may also be caused by insect pests. Host Plants: Dogwood anthracnose infects flowering (Cornus florida) and Pacific dogwoods (C. nuttallii). Call toll-free in *Maryland* at 1-877-620-8DNR (8367) Out of State: 410-260-8DNR (8367) Spot anthracnose leaf symptoms on flowering dogwood. Apply mulch at the base of the tree to conserve moisture in the root zone. Tartarian dogwood. If spot anthracnose is severe on young trees, they can be protected with a registered fungicide applied in the spring at bud break followed by additional sprays every 7 - 14 days until leaves are fully expanded. In wet weather these spots can rapidly enlarge and kill the entire leaf. These plants are relatively hardy but they do have their Achilles heels. Photo: Cheryl Kaiser, University of Kentucky, Bugwood.org. The symptoms are characterized by numerous small (1/16 -⅛ inch) spots with purple borders. Leaves are small or undersized and of a lighter green color and may curl. Photo: Penn State Department of Plant Pathology & Environmental Microbiology Archives, Penn State University, Bugwood.org. The infection is manifested in the form of leaf spots and stem cankers.