Discula destructiva sp. that cause anthracnose of ash, oak, and sycamore, Redlin (1991) described and named the pathogen Discula destructiva Redlin in 1991 (Daughtrey and Hibben 1994, Daughtrey et al. Virginia Cooperative Extension, Charlottesville/Albemarle County Office 460 Stagecoach Road, Charlottesville, Virginia 22902 phone: 434.872.4580 fax: 434.872.4578 ~~~~~ Anthracnose is a name for a group of diseases caused by several closely related fungi that attack many of our finest shade trees. Other diseases include powdery mildew, leaf spot, canker, root rot and leaf & twig blight. Shade trees commonly affected by anthracnose are ash, dogwood, elm, hickory, maple, oak, sycamore, and walnut. Stems show similar symptoms as seen in Figure 5 with a canker at the base of an epicormic branch and Figure 6 showing conidia (spores) exuded from a dead twig infected with Discula destructiva. Comm/Disease/Dogwood PM by AW May, 2002 AW approved Social media. Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. 1994, SAMAB 1996). 3 August 2005. The fungi are dependent on the plant and sometimes plant part invaded. Anthracnose on Deciduous Trees . Britton, K.O. Cornus kousa - Kousa Dogwood - Zone 5; 30'H x 25'W An Asian species that exhibits greater resistance to dogwood anthracnose under normal landscape conditions; vase shaped habit when young; white pointed bracts appear after the foliage emerges in late May - early June. Figures 2-4. Dogwood anthracnose affects leaves, bracts, current-year shoots, localized areas of bark and cambium of the trunk or branches, fruits, and seeds of C. florida (Britton et al. 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. Confirmation of Dogwood Anthracnose. Dogwood anthracnose (Discula destructiva) is often described as the most serious disease that affects dogwood species, specifically flowering (Cornus florida) and mountain (C. nuttallii) dogwood species in the United States. It has been confirmed in northern Georgia. Resistant to anthracnose, this tree (which is a great addition to many Carolina landscapes) is also mildly resistant to damage by deer. Spraying is not necessary unless leaf or flower diseases were a problem in previous years due to consecutive wet, cool springs. In the Southern Appalachians, mortality is most likely at elevations above 3,000 feet. Dogwood Anthracnose: A Threat to Flowering Dogwood1 Eric Holzmueller, Shibu Jose, and Alan Long2 1. Disease severity within infected areas also has increased rapidly. Anthracnose is a common name given to a group of related fungal leaf and stem diseases. Chellemi, D.O., K.O. Dogwood anthracnose is a fungal disease of leaves and twigs. (ed.). Life Cycle If rainy weather persists during flowering, the pathogen is known to infect the "flower" (white bracts). When stressed, is susceptible to a large number of disease problems, most serious is dogwood anthracnose. Several "stellar" hybrid crosses between C. florida and C. kousa are quite resistant to the disease. Dogwood - Dogwood Anthracnose - Cooperative Extension: Insect Pests, Ticks and Plant Diseases - University of Maine Cooperative Extension. 1983. We’re in the South Carolina Botanical Garden on the campus of Clemson University beside a very large dogwood, which in some years is gorgeous, with beautiful white blooms, but this year it has a disease known as … Lower branch dieback, a new disease of northern dogwoods. The early symptoms of discula anthracnose begin in mid to late May as leaf spots with tan or purple borders. Swank. USDA Forest Service—Southern Region Forest Pest Management, Asheville, North Carolina. This document is FOR 127, one of a series of the School of Forest Resources and Conservation, Florida Cooperative Extension Services, Institute of Food and Agricultural Sciences, University of Florida. This publication discusses anthracnose on the shade tree hosts most commonly affected in Kentucky: ash, maple, oak, and sycamore. 4). When stressed, is susceptible to a large number of disease problems, most serious is dogwood anthracnose. Foliar symptoms of infection range from angular-shaped leaf spots and blotches, marginal leaf scorch and a complete blight of infected foliage. Pest Alert We are seeing: (Cornus florida). This practice can introduce the disease into a neighborhood that was previously disease free. p. 42. In the GSMNP, it is estimated that more than 90 percent of the dogwoods have died in heavily shaded cove and alluvial forests. Anthracnose may develop as a foliar blight, in which the turfgrass leaves are infected, or a basal rot, which attacks the leaf sheaths, crowns, and stolons of the plant. Dogwood Anthracnose. Hibben, K.O. Discula sp. 83:633-642. Erin is a native Austinite that loves writing, wikipedia, online window-shopping for home goods, and riding on airplanes. 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. 1993, Daughtrey and Hibben 1983). Leaf spots are round to … Insects, Diseases and Other Plant Problems: Calico scale, dogwood borer, dogwood sawfly, Japanese maple scale, leafhoppers, oyster shell scale. In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. and C.R. In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. Disease severity in the South seems to be more intense at higher elevations. Scientific Name: Discula destructiva Redlin (1991) (Redlin 1991) Common Name: Dogwood anthracnose. Disease severity within infected areas also has increased rapidly. Parham, J.M. Stem dieback from dogwood anthracnose (, Terrestrial (land-dwelling) invasive species, Aquatic (Water-Dwelling) Invasive Species, Public Outreach and Education Materials (Invasive species), Climate Change Impacts on Forest Diseases. Recent Publications. Dogwood Anthracnose (Discula Anthracnose): This is a relatively new disease of dogwood in South Carolina, and it is caused by the fungus Discula destructiva. Daughtrey, M.L., and C.R. 1994). Integrated Pest Management (IPM) Tactics In the landscape, the disease can be kept in check with fungicides. Plant Disease. 77: 34-37. The fungus is killing tree-type dogwoods in the wild. I estimate that 1/3 of the branches have died in the past 3 years. Dogwood Anthracnose. 1988. Daughtrey, J.L., C.R. Anthracnose may develop as a foliar blight, in which the turfgrass leaves are infected, or a basal rot, which attacks the leaf sheaths, crowns, and stolons of the plant. 80:349-357. Leaf spots vary according to light exposure. Other trees that can get anthracnose diseases include catalpa, dogwood, hickory, hornbeam, linden, and poplar. In the eastern United States, the disease has spread rapidly down the Appalachians, primarily on Cornus florida, the eastern flowering dogwood. Dogwood fruits, rich in fat and protein, are a preferred food for turkeys, bobwhite quail, squirrels, rabbits, and deer, as well as numerous non-game species of birds. The head is dark to almost black. There are several similiar fungi causing these diseases. 1996. WSU Extension Hortsense. UT Extension, W847. ANTHRACNOSE. Below 3,000 feet, damage is most severe on moist, cool sites such as northeast-facing slopes (Chellemi et al. Salogga, D.S., and J.F. Anthracnose, a leaf blotch caused by the fungus Gloeosporium, was becoming a common disease of flowering dogwood trees in the late 1970's in western Washington. Anthracnose is a fungal disease that affects plants by forming dead areas on leaves and fruit. Dogwood anthracnose … sp., e and . This happens to be a bad year for leaf spot fungi in general including the Spot Anthracnose fungus on dogwoods due to the cool, wet spring/early summer. On trees other than oaks and sycamores, anthracnose fungi are mostly confined to the leaves. Discussed are the symptoms of the disease, lifecycle, effect on tree growth, and control methods. Today we’re going to talk about a disease on dogwoods known as spot anthracnose. Understory forest dogwoods are more prone to infection than trees growing in full sunlight. Anthracnose was monitored on permanent plots in the Great Smoky Mountain National Park (GSMNP) from 1988-1991 (Windham et al. 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