Fire Blight: Atlanta Diagnosis & Treatment Guide

What Is Fire Blight?

Fire blight is a devastating bacterial disease caused by Erwinia amylovora that attacks members of the rose family, including downy serviceberry, pear, apple, and crabapple. The disease gets its name from the scorched, blackened appearance of infected branches, which look as though they have been burned by fire. In Atlanta's warm, humid springs, fire blight can spread with alarming speed — a healthy branch can be completely blighted within days under favorable conditions.

How to Identify Fire Blight

Fire blight produces some of the most distinctive symptoms of any tree disease:

• Shepherd's crook: The tips of actively growing shoots bend into a characteristic hook shape as the bacterial infection kills the soft new growth.
• Scorched appearance: Leaves and stems turn black or dark brown and remain attached to the branch, giving the tree a fire-damaged appearance.
• Bacterial ooze: During warm, humid weather, droplets of milky to amber-colored bacterial ooze appear on infected tissue. This ooze is highly infectious and spreads the disease to new tissue via rain splash and insects.
• Branch cankers: Dark, sunken cankers form on larger branches where the infection has spread from blighted shoots. These cankers can girdle branches and serve as overwintering sites for the bacterium.

Treatment & Prevention

Managing fire blight requires a combination of cultural practices and careful timing:

• Prune aggressively: Remove infected branches by cutting at least 12 inches below the visible edge of any discoloration. Make cuts during dry weather to minimize spread.
• Sterilize tools: Disinfect pruning tools with 70-percent rubbing alcohol or a 10-percent bleach solution between every cut — the bacterium spreads easily on contaminated tools.
• Copper sprays: Preventive copper-based bactericides applied at bud break and during bloom can reduce infection. Timing is critical and varies with Atlanta's spring weather patterns.
• Avoid excess nitrogen: Heavy fertilization promotes the lush, succulent growth that fire blight preferentially attacks. Use moderate, balanced fertilization schedules.

When to Call an Arborist

Fire blight moves fast. If you notice blackened shoot tips or the characteristic shepherd's crook on your serviceberry, contact an ISA-certified arborist promptly. Professional plant health care programs can include preventive sprays and proper pruning protocols that dramatically reduce fire blight damage. Call EastLake Tree Services at 404-850-1174 or request a free quote.