The trees most often affected in Illinois include ashes, maples oaks, sycamore and walnuts. Diseases: Dogwoods are subject to anthracnose, a fungal disease that causes leaf spotting and twig dieback. The fungus overwinters on corn debris producing spores that infect the next year’s crop. The fungus is not thought to be native to North America, but its origins are unknown. It was first observed in 1976 affecting a population of Cornus nuttallii in Washington state (Byther and Davidson 1979). The fungus Discula destructiva causes extensive damage in North America to the native Cornus species, which are an important landscape feature. Since its discovery in the 1970s, the spread has been swift and the results disastrous to the native Cornus florida. The shoots are also killed in this disease. Frequency. Tomato anthracnose is caused by Colletotrichum coccodes, as an example. Dogwood anthracnose is a relatively new disease to North America. Among some of the more common predisposing factors are drought stress, poor site selection (e.g., full sun, windy or open area, or thin, or rocky soil), mechanical injury (e.g., damage from string trimmers Anthracnose leaf blight of corn. Dogwood Anthracnose Download a PDF of this article Plants Affected. Dogwood anthracnose is more aggressive on trees that have been predisposed or weakened by environmental and cultural factors. Other trees that can get anthracnose diseases include catalpa, dogwood, hickory, hornbeam, linden, and poplar. 1). Trees in a forest setting are more at risk. Anthracnose is a fungal disease that affects plants by forming dead areas on leaves and fruit. The disease is known there as anthracnose and was first noted in the 1970s. Robert L. Anderson, USDA Forest Service, bugwood.org Leaf, fruit, and twig infections can also occur. Anthracnose is typically caused by fungi of the Colletotrichum or Gloeosporium genus, though there are many other genus groups of fungi that can cause this disease, and it … Pacific dogwood (Cornus nuttallii) is very susceptible. It was first observed in 1976 affecting a population of Cornus nuttallii in Washington state (Byther and Davidson 1979). Apply a fungicide during bud break to protect new flowers, twigs, and foliage. There are several similiar fungi causing these diseases. reduce damage from these diseases. Infected dogwood trees stand the best chance of surviving is the infection is caught early, before extensive dieback occurs. In the … Kousa dogwood (C. kousa) and hybrids of kousa and native dogwood (C. florida) are resistant to anthracnose and decline and should be used to replace dying trees. Anthracnose control with fungicides is fur-Managing anthracnose with fungicides The future for anthracnose management looks brighter with new chemistries and an integrated management approach. Additionally, fertilizer applied too late in the season can stimulate new growth, making the tree vulnerable to winter damage. Dogwood anthracnose is a disease of flowering dogwoods caused by the fungus Discula destructiva. Dogwood anthracnose can affect all flowering dogwood species. Dogwood anthracnose is a relatively new disease to North America. An exception is dogwood anthracnose. The fungus is killing tree-type dogwoods in the wild. 3 August 2005. Flowering dogwood (Cornus florida) and the Kousa dogwood (Cornus kousa). Disease Facts Anthracnose leaf blight of corn caused by the fungus Colletotrichum graminicola is an economically important foliar disease of corn in New York State especially in no-till or reduced till fields.. Two years later, Pirone (1980) noticed a widespread and rapid deterioration of flowering dogwoods in New York and Connecticut (Fig. While this is a common and unsightly shade tree disease, anthracnose is rarely fatal to a tree. These spots are often incorrectly diagnosed as the less damaging leaf spot disease. Spot anthracnose is usually not a source of significant damage but can weaken a tree if it occurs for several years. Healthy, vigorous growing trees should quickly recover. General defoliation of sycamore caused by anthracnose. It overwinters in twigs and fruits, and spores infect the bracts in the spring if moisture is present. Protect trees from drought stress, winter injury, and dogwood borer attack. The fungi are dependent on the plant and sometimes plant part invaded. However, repeated infections can weaken trees. Dogwood (Discula) anthracnose. Anthracnose Disease Info. Symptoms/Damage Leaves The second most common type of damage was indirect defoliation associated with wood boring insects and vascular diseases such as oak wilt, white pine blister rust, dogwood anthracnose, and beech bark disease. Under Attack. Figure 7. This publication discusses anthracnose on the shade tree hosts most commonly affected in Kentucky: ash, maple, oak, and sycamore. Most of the damage is considered minor; however, when other stress conditions are present, damage can be significant. 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. _ecology/dogwood_anthracnose.pdf. (3) The dogwood twig borer (Oberea tripunctata Swederus) kills shoots, causing the leaves to hang on the tree as they may in dogwood anthracnose. 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