Dogwood Tree Diseases Anthracnose

Dogwood anthracnose is the most common disease that affects dogwood trees. Caused by the fungus Discula destructiva, anthracnose thrives in moist shade. Symptoms begin on leaf borders with purplish blotches that eventually cover the leaf.

Dogwood tree diseases anthracnose. The dogwood tree is commonly grown for ornamental purposes, often as a standalone tree. It is popular for its exotic, bright-colored flowers. Some dogwood varieties grow red berries during the early winter season. Dogwoods are low-maintenance trees but they are susceptible to some garden diseases. the tree as they may in dogwood anthracnose. The main difference is that foliage affected by twig borer damage is clumped rather than scattered throughout the affected portion of the tree crown. The emerging borer causes a hole in the affected shoot. One of the most common tree diseases, for example, is known as dogwood anthracnose, and it’s caused by a fungal infection. The rainy season the Northwest is famous for can render your trees particularly vulnerable. Anthracnose starts with brown splotches on the leaves; as the fungus spreads, it will move into the stems. Dogwood Anthracnose is a very common and visually unappealing disease to which the Cornus florida is extremely susceptible. 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 was used to.

Dogwood anthracnose (Discula destructiva) symptoms on flowering dogwood. Photo: John Hartman, University of Kentucky, Bugwood.org . Dogwood Anthracnose (Discula destructiva) In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. It causes dieback or even death of infected trees. The fungus persists through years and may cause infection to spread further throughout the tree. Dogwood Anthracnose: One of the very common diseases of dogwood trees is the dogwood anthracnose which is caused by the fungus Discula sp. The infection is manifested in the form of leaf spots and stem cankers. The shoots are also killed in this. Pacific dogwood (Cornus nuttallii) is very susceptible. Flowering dogwood ( C. florida ) is moderately susceptible but is severely damaged under conditions ideal for disease development. Many but not all cultivars of Kousa dogwood ( C. kousa ) are very resistant ( C. kousa var. chinensis has been quite susceptible in some studies). The fungus Discula destructiva causes dogwood anthracnose leaf blight and canker. Host Plants: Dogwood anthracnose infects flowering (Cornus florida) and Pacific dogwoods (C. nuttallii). Kousa dogwood (C. kousa) is also susceptible to infection but is highly resistant to the disease and typically suffers only minor leaf spotting. Other common landscape dogwoods, such as

Dogwood Anthracnose. Caused by the fungus Discula destructive, dogwood anthracnose attacks the tree causing masses of spores to appear on the bark. Spot anthracnose, Dogwood anthracnose can lead to tree death under certain environmen­ tal conditions. The fungus has caused extensive mortality of dogwoods in portions along the East Coast into the Southeastern United States since it was first discovered in the early 1970s. Dogwood anthracnose is known Dogwood anthracnose. NatureServe / Flickr / Creative Commons Attribution 2.0 Generic (CC BY 2.0) Anthracnose on Roses . Sphaceloma rosarum, the fungus that causes anthracnose on roses, is different from the fungi causing tree anthracnose. Dogwood anthracnose is a relatively new disease to North America. It was first observed in 1976 affecting a population of Cornus nuttallii in Washington state (Byther and Davidson 1979). Two years later, Pirone (1980) noticed a widespread and rapid deterioration of flowering dogwoods in New York and Connecticut (Fig. 1).

The early symptoms of discula anthracnose begin in mid to late May as leaf spots with tan or purple borders. Key Points. In the past, anthracnose was the most serious disease of dogwoods in the landscape and our forests but it is now less common. The dogwood anthracnose symptoms will gradually progress up the tree to the upper crown as the fungus spreads to the twigs and trunk, causing brown elliptical cankers. Leaves that show the dogwood anthracnose spots will not fall off in the fall and often remain on the tree until spring. In order to distinguish between anthracnose and other leaf spot diseases, you should carefully examine the undersides of leaves for a number of small tan to brown dots, about the size of a pin head. If you are unsure about diagnosing anthracnose, consult your local Cooperative Extension office for assistance and additional anthracnose disease info. Anthracnose is a term applied to an array of fungal diseases that affect shade trees. Different fungi target different tree species. Sycamore, oak (especially white oaks), maple, ash, walnut, and dogwood are especially vulnerable to anthracnose, which may cause leaf and shoot blight, defoliation, and twig dieback.

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. Leaf and flower blight Irregular, brown, wrinkled patches form on flower bracts and leaves in the spring. Dogwood anthracnose, Discula destructiva, can be a devastating disease of flowering dogwoods in the eastern United States, and Pacific dogwood in the Pacific Northwest.Although most infections occur on landscape trees, it can also be found on native dogwoods in natural areas. Symptoms are most visible during rainy, cool spring weather.