improved cultivars, such as the London Plane, are somewhat resistant. Keep your dogwoods healthy with these tips. succulent branches on plants, rendering them more susceptible to dogwood anthracnose. The greatest hope for long-term management of dogwood anthracnose is the discovery of genetic resistance in this host. In full sun, dogwoods are more susceptible to dogwood borer. This pest should be monitored visually and with pheromone traps when needed, and treated before t i infects the tree. Kousa dogwood is an excellent small specimen tree. Spot anthracnose is more common. Symptoms/Damage Leaves Key Points. Dogwood anthracnose can affect all flowering dogwood species. Disease-Resistant Dogwoods Recent progress has been made in developing dogwoods that resist disease -- especially anthracnose and other fungal attackers. Cornus kousa 'Steeple', a clone of C. kousa 'Milky Way', C. x Stardust®, C. x Stellar Pink®, and C. x Celestial™ were found to be resistant to dogwood anthracnose as indicated by < 1 % Under Attack. : Resistance to Dogwood Anthracnose Table 1. Anthracnose is a fungal disease that affects plants by forming dead areas on leaves and fruit. Two outstanding characteristics are the four-petaled, white flowers that appear above the foliage in June and reddish-purple fall color. Dogwood Anthracnose Information Dogwood blight, also known as dogwood anthracnose for the fungal pathogen that causes the disease, is a fairly new problem. Thus, to say that kousa dogwood is resistant to dogwood anthracnose doesn't mean it can never get the disease. Most are white-flowered (Stellar Pink® has pink flowers). Kousa dogwood (Cornus kousa) is generally resistant to dogwood anthracnose and is a better choice for replanting in sites where dogwoods have died from this disease. Anthracnose attacks twigs, branches, trunks and leaves of dogwoods in cool, wet weather. 84 Brown et al. These diseases left such a big effect on the nursing industry, it forced some small nurseries out of business. Cornus florida, commonly known as the flowering Dogwood, is very common in our area and is even Virginia’s state tree.Now days, we utilize Dogwoods for their aesthetic appeal; however, during the American Civil War they were best known for their bark which … It infects and kills the leaves and young shoots of some North American Cornus species (dogwoods).Cornus florida is particularly susceptible, Cornus nuttallii and Cornus kousa may also be attacked. Researchers with UTIA began looking for dogwood tree specimens that showed resistance to the diseases. Don’t let this opportunity to plant a real showstopper pass you by! In the eastern states, flowering dogwood infections have been reported in Massachusetts, Connecticut, New York, New Jersey, Pennsylvania, and Delaware. Dogwood anthracnose (Discula destructiva) is an interesting disease. Research Plant Pathologist, Brooklyn Botanic Garden Research Center, 712 Kitchawan Rd, Ossining, NY 19562. It means that in most cir-cumstances it's unlikely to be infected and that an 1. It can attack many different types of plants, from grasses to flowering trees such as dogwood. Pacific dogwoods frequently experience spring leaf drop while both In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. The following list is presented in most susceptible to least susceptible: Pacific dogwood (Cornus nuttalii), flowering dogwood (Cornus florida). Problems: Some kousa dogwoods and their hybrids are more resistant than flowering dogwood to dogwood anthracnose, powdery mildew, spot anthracnose, and common dogwood borers than flowering dogwood. Dogwood anthracnose is not all that common, only occurs at 1800 feet or higher elevation. Dogwood anthracnose symptoms include tan spots with red edges that often join together. See list below of resistant dogwoods (7, 8). Dogwood Anthracnose is a very common and visually unappealing disease to which the Cornus florida is extremely susceptible. Dogwood anthracnose is a disease that affects the flowering and Pacific dogwood (Cornus florida and C. nuttallii).Pacific dogwood infections have been reported in Washington, Oregon, Idaho, and British Columbia. Dogwood Anthracnose Symptoms. Most resistant to dogwood anthracnose is Cornus kousa (and its slightly larger version, C. kousa variety chinensis). In the late 80s up to the mid 90s, two fungal diseases, Dogwood anthracnose and powdery mildew, hit the dogwood population. Like the flowering dogwood, it prefers shade, needs ample moisture, supports native butterflies and insects, and is a valuable food source for wildlife and birds. taxa were found to be immune to dogwood anthracnose, yet there was considerable variation in resistance to the disease. The fungus Elsinoë corni causes a spot anthracnose primarily on Cornus florida. A destructive disease known as anthracnose can tarnish its image. It is found mainly on the native dogwoods, especially Pacific dogwood, but can also infect some ornamental dogwoods. Dogwood anthracnose is a fungal disease of leaves and twigs. Kousa dogwood (Cornus kousa) is considered resistant Symptoms/Damage Leaves In the Midwest, this is a hardier substitute for the acid-loving flowering dogwood. Trees exhibit signs of infection via tan, blotchy leaf spots. Resistant to anthracnose, this tree (which is a great addition to many Carolina landscapes) is also mildly resistant to damage by deer. The following list is presented in most susceptible to least susceptible: Pacific dogwood (Cornus nuttalii), flowering dogwood (Cornus florida). The disease can infect flower bracts, leaves, and fruit. Dogwood anthracnose is a problematic disease that all dogwood owners must take seriously. Fall foliage is a showy red color. The leaves display small to large irregular brown blotches or occasionally purple-edged spots. Dogwoods ideally should be planted to receive full morning sun and afternoon shade. Avoid use of overhead sprinklers that wet foliage. When planting new dogwoods in areas with anthracnose, avoid planting in dense shade. Kousa dogwood (Cornus kousa) is considered resistant. It is believed to have started in the northeastern United States about 25 years ago, but has been spreading southward ever since. A fungal disease named dogwood anthracnose was sickening and ultimately killing the flowering dogwoods in Maryland’s Catoctin Mountain Park. The shallow root system will benefit from a layer of mulch to maintain a cool root environment. Dogwood anthracnose can affect all flowering dogwood species. Flowering dogwoods (Cornus florida) which are commonly found in Virginia and Pacific dogwoods (C. nuttallii) are susceptible to Dogwood Anthracnose. 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. BioAdvanced 3-in-1 – Best Fungicide for Dogwood Anthracnose. This disease should not be mistaken for another more serious dogwood disease called dogwood anthracnose caused by the fungus Discula destructiva. The dogwood has been considered a treasure in the landscape for years. Results of 1991 anthracnose resistance screening study.1 Materials and Methods Trees were grown in 5-gallon containers in a composted bark mix commonly used in the pro-duction of woody ornamental species. A fungus that was previously unknown to science causes dogwood anthracnose. Dogwood anthracnose is a disease that affects mature dogwood trees throughout the United States. Dogwood Anthracnose Download a PDF of this article Plants Affected. Cornus anthracnose is a fungal disease caused by Discula destructiva, which arrived in the UK from North America in the late 1990s.. It causes dieback or even death of infected trees. This disease appeared suddenly on both the east and west coasts of the United States in the late 1980's and spread rapidly throughout the country. Several "stellar" hybrid crosses between C. florida and C. kousa are quite resistant to the disease. Trees are also susceptible to powdery mildew, leaf spot, canker, root rot and leaf, and twig blight crown canker, bacterial leaf scorch, powdery mildew, septoria leaf spot. A couple of decades ago, the disease hit the Pacific Northwest with a vengeance. It is highly recommended for use as a remedy to dogwood anthracnose because it kills fungi efficiently attacking flowering and Pacific dogwoods. It grows in USDA hardiness zones 3-7, placing Virginia in its most southern zone. Although urban trees were affected most severely (undoubtedly because of greater disease pressure and other stresses), trees in undisturbed native habitats were also diseased. Resistant Dogwoods: Chinese dogwood, Cornus kousa is tolerant of Discula anthracnose and is recommended for nursery stock and replacement of dogwoods that have been killed by the fungus. What is cornus anthracnose? In addition, a timed-release fertilizer (Osmocote™ 14-14-14) SYMPTOMS: Sycamore anthracnose symptoms include , blotchyirregular lesions that lead to shoot dieback and blighted areas. Prune dogwoods and surrounding plant material to increase air circulation. 'False' nectaries were created by adding a droplet of 1.5:1 sugar:water as a reward to the base of each bract. Hybrid flowering dogwood, a cross between flowering dogwood and Kousa dogwood, is represented by several cultivars in the trade. Another possible substitute is Cornelian cherry, Cornus mas. These cultivars are resistant to dogwood borer and dogwood anthracnose (a serious disease). Landscape Use: Kousa dogwood is best used as a border accent, near a deck or patio, or as a specimen. Dogwood cultivars resistant/tolerant to dogwood anthracnose Cultural practices Water during dry periods to reduce drought stress. Breeding between flowering dogwood cultivars resistant to dogwood anthracnose ('Appalachian Spring') and resistant to powdery mildew ('Cherokee Brave') was conducted in cages where pollination was mediated by honey bees (Aphis mellifera). Surviving seedlings of C. florida in woodland sites have been identified as candidates for resistant stock; eight were discovered in Catoctin Mountain Park, MD, in 1991 - 1992. Varieties, hybrids and cultivars Key Points. The native pagoda dogwood is resistant to anthracnose. Anthracnose Resistant Dogwoods C. … If this disease is a recurring problem, resistant dogwood cultivar or hybrids need to be considered for planting. This particular product actively wards off insect pests and cures fungal diseases. The early symptoms of discula anthracnose begin in mid to late May as leaf spots with tan or purple borders. 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