Specifically we take a look at the health of a Dog Wood Tree in Doug's yard. This is true with a host of fungal and bacterial diseases of dogwood or tiny insects that may infect or infest your dogwood tree. Spray the bark with a synthetic insecticide registered for dogwoods (active ingredient chlorpyrifos) in mid-May and mid-June. Take notice of your tree’s leaves. These numerous lesions normally will occur on dry leaves, which will die. Do not allow the mulch to touch the trunk. Spot anthracnose, septoria leaf spot, and powdery mildew are all conditions that affect the leaves. Dogwood is a popular ornamental tree with its flowering bracts, elegant foliage, and bright red fruits. A similar disease was found on western flowering dogwoods, (Corpus nuttallii Audubon) in western Washington … There are several different species of septoria (purple spots with gray centers) that can infect dogwoods but already-stressed trees are the most vulnerable to the disease, which usually does not become a severe problem until mid to late summer depending on weather conditions. Hopefully, this article will provide at least some of those solutions. There are listed fungicides and bacterial agents to combat the various disease issues affecting dogwood trees. The infection begins at the tip, spreading down the midvein, producing a wedge-shaped appearance. Secondary signs may include cankers on twigs and smaller branches. Just be sure it doesn’t touch the trunk. Numerous small shoots may grow from the trunk. Rake and destroy fallen leaves. But sometimes your beautiful dogwood suddenly doesn't look so pretty anymore. Showy blossoms of white, pink, or red appear in spring before the leaves. Powdery mildew, an unsightly fungal infection, doesn't usually kill the tree but probably weakens it until another pest comes along and delivers the final blow. Dogwood Tree Problems. Sometimes referred to as the Chinese dogwood, this Asian cousin to our native flowering dogwood can be used as a specimen plant or in shrub borders. In Grumpy's opinion, flowering dogwood (Cornus florida) still remains the best small tree for multi-season interest.Not just in the Southeast, either -- for the Northeast and Midwest too. Thanks for the great tips. The environment you provide for them needs to be similar. A number of factors other than insects or diseases can contribute to the decline of dogwoods in the landscape, especially mower injury, over-fertilization, and poor growing conditions.Leaf Scorch: Leaf scorch is caused by environmental conditions that are too dry. According to laws regulating pesticides, they must be used only as directed by the label. There are listed fungicides and bacterial agents to combat the various disease issues affecting dogwood trees. And your symptoms don't match. It is rare to find such conditions within city limits. The dogwood tree is commonly grown for ornamental purposes, often as a standalone tree. I'm researching some other dogwood problems and will be adding more to the article soon. The borers cannot chew through uninjured bark but borers in various stages of development can be found at the edge of. Kousa dogwood trees aren’t very drought-tolerant, so make sure to keep the soil moist throughout the summer, especially in the first three years when the tree is establishing itself. Apply a 5-10-10 fertilizer and water it well, especially during dry weather. The Kousa dogwood is a handsome, small- to medium-sized tree reaching a mature height of 30 feet. Symptoms include dieback on the branches in the early summer with dried leaves on twigs. Asked July 24, 2015, 4:29 PM EDT. There are several damaging diseases and pests that affect dogwood trees. Pests and Diseases. is susceptible to several problems, including diseases that attack its bark, causing varying degrees of damage. Flowering dogwoods are understory trees that do not tolerate long periods of full sun. These plants are relatively hardy but they do have their Achilles’ heels. Flowering dogwood (Cornus florida)is a small Maryland native tree with white or pink flower bracts in the spring, colorful foliage in the fall, and berries that support wildlife. The infected leaves will usually drop before the fall season, defoliating the tree. Look for angular brown leaf spots that often have a purple border, a sign that your tree has been infected with Septoria leaf spots. Several bark diseases affect the dogwood. 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. Avoid wounding the trunks and branches with lawnmowers, trimmers, etc. Sign up to get all the latest gardening tips! Spray the foliage in the early spring with organic copper-sulfate fungicide. Depending on the age of the Kousa dogwood, the trees take on a different appearance. Provide additional moisture if required or afternoon shade--noon to 5 p.m. Drought and water stress Unfortunately, for some people, their dogwood trees become problematic over the years causing them to go scrambling for solutions to the many different problems that can arise. With careful planting and some tender, loving care you’ll help your dogwood tree ward off several common problems. Symptoms on twigs - Infected twigs will have sunken spots that are tan to brown with purple borders. Use mulch 3 to 4 inches (7.5-10 cm.) Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. The leaves and fruit become a stunning bright red/purple color in the fall, and in the winter there are large, flattened buds with dark bark that resembles alligator skin. When planting new dogwood, there are several steps to help prevent bark diseases. Dorothy is a Master Gardener, former newspaper reporter, and the author of several books. Dogwood borers (Synanthedon scitula) - Dogwood trees attacked by borers (clear-winged moths which begin emerging in late May to September) will display swollen, knotty, calloused or gall-like areas on the trunk, at or immediately below the ground surface (possibly between the ground surface and the branches above). Flower color: White is the usual color of the dogwood’s petal-like bracts, but some are pink or even pale red, such as C. florida ‘Rubra’. Here at Gardening Know How our goal is to try to provide answers to all of the inquiries you send our way. It starts out with blighted leaves, showing purple margins, and tan color around the edges of leaves. When choosing dogwood for landscaping, be sure the trees are healthy. We have all heard the fables about how even the smallest can bring down the mighty. Investigate whether a diseased tree or plant previously grew where the dogwood tree is now planted. These plants are relatively hardy but they do have their Achilles? Apr 16, 2015 - Dogwood is a popular ornamental tree with its flowering bracts, elegant foliage, and bright red fruits. Dogwood Anthracnose Caused by the fungus Discula destructive, dogwood anthracnose attacks the tree causing masses of spores to appear on the bark. The first symptom is small leaf spots with purple halos, which may expand to form larger tan blotches. The Dogwood is currently at risk for both fungus and pest infestations, which is why it is important to buy the sapling from an arborist instead of transplanting the tree from the wild. Leaves have dry and browning edges. The flowers, fruit, leaves and young shoots are all affected by small, purple lesions that are no larger than the head of a pin. Significant loss of vigor and illness can result when these tiny marauders invade in quantity. Pamela Oglesby from Sunny Florida on December 11, 2019: I have a dogwood tree and have had some problems from time to time but it is doing well now. Dogwood anthracnose may spread to the twigs, larger branches, and trunk, causing dieback. Dogwood Tree Problems. The following will list the symptoms of each, along with a possible solution (if there is one): Spot Anthracnose - This fungal disease usually occurs in the spring due to a fungus called Elsinoe corni (primarily on Cornus florida). Don't Give Up On Dogwood But that doesn't mean you shouldn't try dogwoods. The disease, Discula destructiva, causes leaf, twig and branch dieback beginning in the lower part of the tree. Injuries can also be seen at the union of the trunk and branches or smaller twigs and branches. Check with your local County Extension office for help in treatment or contact a certified arborist. It causes yellow leaves, twig dieback, and sunken discolored areas of tissue; however, these symptoms are also common with branch canker and crown canker as well. Eventually, the disease spread throughout the Appalachian Mountains, West Virginia, Virginia and Maryland. Spot anthracnose, septoria leaf spot and powdery mildew are all conditions that affect the leaves. Dogwood anthracnose is one of the most common fungal diseases to attack this plant. On twigs and smaller branches tan blotches red berries during the early spring with copper-sulfate! 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