Dante Carrillo
Dogwood trees are understory trees that thrive in part or filtered sunlight. They are susceptible to a variety of diseases, including a new species of fungus called Discula Destructiva, which causes leaf spots and can kill the tree. To keep your dogwood tree healthy, ensure it is planted correctly, with its trunk not buried and its roots flared. Keep the roots moist and well-mulched, and provide additional water during droughts. Monitor the tree for signs of disease, such as leaf spots or dying lower limbs, and treat with fungicides if necessary.
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What You'll Learn
- Dogwood anthracnose: A disease that spreads from flowers to leaves, forming cankers on the trunk
- Proper planting: Ensure the trunk isn't buried, roots are watered and mulched, and the tree is planted in partial sun/shade
- Root care: In light potting mixes, roots can grow 10-11 inches deep; spread roots to prevent rotting
- Watering: Keep the tree well-watered, especially during the first two years, to help establish roots
- Disease prevention: Remove affected branches before the disease reaches the trunk to slow its progression
Dogwood anthracnose: A disease that spreads from flowers to leaves, forming cankers on the trunk
Dogwood anthracnose is a serious disease that affects various dogwood species. It was inadvertently introduced to eastern North America from Asia in the late 1970s and quickly spread throughout the region, decimating natural populations of flowering dogwood in southern New England. Caused by the non-native fungal pathogen Discula destructiva, the disease primarily affects flowering dogwoods (Cornus florida) and Pacific dogwoods (C. nuttallii).
The symptoms of dogwood anthracnose can vary depending on the stage of the disease, but common signs include leaf spots, blighted leaves, twig dieback, and canker formation. Initially, symptoms manifest as small, tan spots with irregular purple margins on leaves, which can eventually enlarge and merge, leading to large brown blotches. As the disease progresses, entire leaves may become blighted, turning brown or tan and falling off prematurely. The disease can move from the leaves into the twigs, causing twig dieback and canker formation.
To prevent and control dogwood anthracnose, early detection is crucial. If you notice any symptoms, take immediate action to manage and limit the spread. Apply mulch around the base of the tree to prevent soil from splashing onto the lower leaves and apply fungicides in the spring when new leaves are emerging. Multiple applications may be needed during the growing season, especially during wet conditions. It is important to consult local agricultural extensions for the most current and localized recommendations for fungicide use.
In addition to chemical controls, cultural practices can also help. Ensure adequate sunlight, mulching, and watering during periods of drought or yearly fertilization. Prune and discard blighted shoots and stems as they develop, and remove any epicormic sprouts that form as a result of the disease. While no dogwood variety is completely immune to the disease, some are far less susceptible. Kousa dogwood (Cornus kousa) is highly resistant, often exhibiting only minor leaf spotting. Other resistant varieties include Tatarian dogwood (Cornus alba) and Redosier dogwood (Cornus sericea).
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Proper planting: Ensure the trunk isn't buried, roots are watered and mulched, and the tree is planted in partial sun/shade
Dogwood trees are understory trees, which means they ideally need to be planted in partial sun or shade. To ensure your dogwood tree thrives, proper planting is essential. Firstly, make sure the trunk is not buried. Check that the tree's roots are flared and not bound, as this can cause them to rot and lead to the plant's failure. Keep the roots watered and well-mulched, but avoid touching the tree trunk. In the first couple of years, you may need to deep water your dogwood tree weekly during the summer until the roots are established.
Dogwoods are sensitive trees, and their health can be affected by various factors. For example, they can be susceptible to a disease called anthracnose, which is characterised by black spots on the leaves that increase in size over time. This disease can eventually cause cankers to form on the trunk, which can be fatal to the tree. Therefore, it is important to monitor your dogwood tree for any signs of disease and treat it promptly.
Additionally, dogwood trees can be sensitive to their environment. While they can tolerate full sun, they may curl their leaves to protect themselves from the sun's intensity. If you notice leaf curling, consider moving your tree to a shadier location.
By following these proper planting and care techniques, you can help ensure your dogwood tree thrives and has a long and healthy life.
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Root care: In light potting mixes, roots can grow 10-11 inches deep; spread roots to prevent rotting
Dogwood trees have shallow roots, so it is important to take good care of them to prevent rotting. Firstly, ensure that the soil is well-drained and has a pH of 5.5 to 7.0, leaning slightly acidic. You can test this by checking if acid-loving plants like azaleas, camellias, and gardenias are growing well in the area. If they are, the soil pH is likely suitable for a dogwood tree.
When planting a dogwood tree, it is important to keep the roots moist and healthy. If the tree arrives bare-rooted, soak them in water for 6-24 hours before planting. If the tree is in a container, tap it out and settle it in the planting hole, firmly backfilling the soil around it to eliminate air pockets at the root zone.
Once the tree is planted, water at the roots to keep the foliage dry and maintain consistent soil moisture for the first year. Deep, less frequent soaks are better than shallow, frequent watering, as this promotes deep root growth and reduces water loss through evaporation. Always check the soil moisture before watering and only water when the top 2 inches of soil are dry or lightly damp.
To retain moisture, mulch over the root zone to a depth of 3 feet, spreading out to 3 feet outside the canopy, but keeping it 2 feet away from the main trunk. This will also help prevent weeds from growing. If your dogwood tree is on a slope or in an area with a water shortage, create a berm by building up a 2-foot rim of soil around the tree above ground level to keep the water close.
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Watering: Keep the tree well-watered, especially during the first two years, to help establish roots
Watering is critical for the survival of a dogwood tree, especially during the first two years, as this is when the tree develops its anchoring and feeding root systems. The goal is to help the tree establish a healthy root system with as little stress as possible.
The amount of water required depends on several factors, including the size of the tree, the surrounding conditions, and the type of soil. For example, a larger tree with a more extensive root system will require more water than a smaller tree. Dogwood trees planted in full sun will also require more water than those in partial shade. Additionally, dry soil will need more water than moist soil.
To ensure your dogwood tree receives adequate water, consider the following:
- Water the tree thoroughly each day for the first two days after planting to settle the soil and remove air pockets around the roots.
- For the first five days after planting, water thoroughly, especially during the summer.
- After the initial waterings, follow a regular watering schedule, increasing irrigation volume as the roots grow and spread.
- During the first two years, water weekly to ensure the roots are well-established.
- Pay attention to the surrounding weather conditions and increase watering during periods of high temperatures, low rainfall, or drying winds.
- Water slowly and directly over the root ball to encourage deep root development.
- Use a handheld hose or soaker hose, laying it 1-2 feet from the trunk and moving it around the root ball as the water is absorbed.
- Create a water reservoir by making a circular mound of earth 3-4 inches high around the plant at the edge of the root ball, and fill it with a slow trickle of water.
- Use mulch to retain moisture in the soil and prevent evaporation.
- Avoid over-watering, as this can lead to root rot and other issues.
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Disease prevention: Remove affected branches before the disease reaches the trunk to slow its progression
Dogwoods are beautiful trees, but they are susceptible to a variety of diseases, the most notable of which is anthracnose. This disease is initially characterised by black spots on the leaves about a quarter of an inch in diameter. As the disease progresses, the outer half of the leaf will die, and the lower branches will die out, with the entire tree succumbing within one to three years. In the 1990s, a particularly virulent form of anthracnose, caused by a new species of fungus (Discula destructiva), spread across the eastern United States, killing millions of dogwood trees.
The key to disease prevention is early action. If you notice spots on the flowers or leaves of your dogwood, it is time to take action. Spraying daconil over the entire tree can help treat anthracnose when it is caught early. However, if left untreated, the disease will spread to the trunk, causing cankers to form, which is often fatal to the tree.
Therefore, it is crucial to remove affected branches before the disease reaches the trunk. While this may damage the aesthetic appeal of the tree, it can help slow the progression of the disease and potentially save the tree's life. It is a trade-off between the tree's beauty and its survival.
Additionally, it is important to distinguish between different types of leaf-spot diseases. For example, 'spot anthracnose' causes small spots one-sixteenth of an inch across. On the underside of these larger spots, you may see tiny black or brown scattered dots, which indicate the presence of Discula destructiva.
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Frequently asked questions
If you notice that the leaves of your dogwood tree are turning black or tan, this could be a sign of a disease called anthracnose. Other signs of this disease include spots on the flowers and cankers forming on the trunk. If left untreated, anthracnose can be deadly to dogwood trees.
To prevent your dogwood tree from dying, make sure it is planted in an area with partial sun/shade. Keep the roots of the tree watered and mulched, without touching the trunk. If your tree is affected by anthracnose, spray daconil over the entire tree as soon as you notice spots on the flowers.
Dogwood trees are susceptible to a type of fungus called Discula destructiva, which can cause the lower branches of the tree to die. This fungus has been particularly prevalent in the eastern United States, affecting thousands of wild trees.
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