Dogwood Anthracnose: Atlanta Diagnosis & Treatment Guide

What Is Dogwood Anthracnose?

Dogwood anthracnose is a serious fungal disease caused by Discula destructiva that has devastated native flowering dogwood (Cornus florida) populations throughout the eastern United States since the 1970s. For Atlanta homeowners, this is particularly concerning because the flowering dogwood is one of the city's most beloved understory trees, prized for its spectacular spring blooms and vibrant fall color.

The disease thrives in cool, wet spring weather—exactly the conditions that Atlanta often experiences in March and April. Trees growing in shaded, moist environments with poor air circulation are most vulnerable, making many residential dogwoods prime targets.

How to Identify Dogwood Anthracnose

Recognizing dogwood anthracnose early gives you the best chance of saving an infected tree. Look for these symptoms in sequence:

• Leaf spots: Small tan or brown spots with purple-reddish borders appear on leaves, often starting on lower branches. Spots may enlarge and merge, consuming entire leaves.
• Twig dieback: Current-year twigs die back from the tips. Dead twigs with attached brown leaves persist through winter, creating a characteristic "flagging" appearance.
• Cankers: Sunken, discolored lesions develop on branches and the main trunk. These cankers girdle branches, cutting off water and nutrient flow.
• Epicormic sprouting: The tree produces clusters of small shoots directly from the trunk as a stress response. While these sprouts may look like new growth, they indicate the tree is struggling to compensate for canopy loss.

In severe cases, cankers extend to the main trunk and the tree dies within two to three years. Atlanta's dogwoods growing under dense shade in naturally moist sites are at highest risk.

Which Atlanta Trees Are Most Susceptible?

• Flowering Dogwood (Cornus florida): The native species is highly susceptible. Trees growing in full shade, on north-facing slopes, or near streams are at greatest risk. Stressed trees—those weakened by drought, poor soil, or root damage—succumb more quickly.

The Kousa dogwood (Cornus kousa) and hybrid varieties like 'Stellar' series show significantly greater resistance and are worth considering as replacements where anthracnose is a recurring problem.

Treatment Options

Managing dogwood anthracnose requires an integrated approach combining cultural practices with targeted treatments:

• Fungicide applications: Chlorothalonil or mancozeb sprays applied at bud break and repeated at two-week intervals through bloom can protect new growth. Timing is critical—treatments must begin before symptoms appear.
• Pruning infected tissue: Remove all cankered and dead branches, cutting well below visible infection. Sanitize pruning tools between cuts. Prune during dry weather to minimize spore spread.
• Improve air circulation: Thin surrounding vegetation to increase airflow around the dogwood canopy. This reduces the leaf-wetness duration that the fungus needs to infect.
• Avoid overhead irrigation: Wet foliage promotes infection. Water at the base of the tree using drip irrigation or soaker hoses.

A comprehensive plant health care program can strengthen your dogwood's natural defenses by optimizing soil nutrition, managing moisture, and reducing competition from surrounding plants.

Prevention Strategies

The most effective prevention for Atlanta dogwood owners combines site management with proactive care:

• Site selection: When planting new dogwoods, choose locations with morning sun and afternoon shade, good air circulation, and well-drained soil. Avoid low-lying areas where moisture lingers.
• Mulching: Apply two to four inches of organic mulch around the base (keeping it away from the trunk) to moderate soil temperature, retain moisture, and reduce stress.
• Watering: Provide supplemental irrigation during Atlanta's summer droughts. Stressed dogwoods are far more susceptible to anthracnose infection the following spring.
• Rake and remove fallen leaves: The fungus overwinters in infected leaf litter. Removing fallen dogwood leaves in autumn significantly reduces the inoculum available for spring infections.
• Consider resistant varieties: If replacing a lost dogwood, Kousa and Stellar series hybrids offer the ornamental appeal of flowering dogwood with much greater disease resistance.

When to Call an Arborist

Call an ISA-certified arborist if you notice leaf spots, twig dieback, or cankers on your dogwood—especially in spring after wet weather. Early professional assessment and treatment can prevent the disease from reaching the main trunk, where it becomes lethal. An arborist can also evaluate whether your tree's site conditions are predisposing it to infection and recommend cultural changes to improve long-term health.

Atlanta-Specific Considerations

Atlanta's climate is something of a double-edged sword for dogwoods. The warm summers favor the tree's growth, but cool, rainy springs—especially in March and April—create perfect infection windows. The city's dense urban canopy and heavy tree cover in neighborhoods like Druid Hills, Virginia-Highland, and Inman Park often means dogwoods grow in deep shade with limited air movement, compounding the risk.

Georgia red clay soils can hold water near the surface, keeping root zones wet and stressing dogwoods that prefer well-drained conditions. Amending soil around established dogwoods is difficult, making site selection at planting time especially important.

EastLake Tree Services has extensive experience managing dogwood anthracnose across metro Atlanta. Our arborists develop customized treatment plans that account for your tree's specific site conditions, infection status, and long-term prognosis. Call us at 404-850-1174 or request a quote to protect your dogwoods.