Pear Fire Blight: Symptoms, Lookalikes and Next Steps

“Pear blight” usually refers to fire blight, a bacterial disease caused by Erwinia amylovora. Pears can be highly susceptible, but not every black leaf or dying branch is fire blight. This page helps pear growers triage symptoms; our complete fire blight guide covers the full disease cycle and management plan.

Signs that point toward fire blight

• Blossom clusters wilt and turn brown or black.
• New shoot tips bend into a shepherd’s crook.
• Dark leaves remain attached along a killed shoot.
• Dieback advances from blossoms or tender shoots into older wood.
• Sunken or discolored cankers develop; ooze may appear in warm, humid conditions.

Problems that can look similar

• Freeze injury: damage follows a cold event and may affect exposed flowers or shoots uniformly.
• Drought or root stress: wilting may be widespread rather than moving from individual blossoms or shoots.
• Broken or girdled branches: everything beyond a physical injury declines.
• Leaf spots, rust and mites: these primarily mark or distort leaves rather than producing the classic progressive shoot blight pattern.
• Herbicide or chemical injury: symptoms can appear suddenly across exposed foliage.

For spots, orange lesions, curling or blistering without shoot dieback, use our pear leaf-problem identification guide.

What to record before acting

1. Photograph the whole tree, affected branch, symptom boundary and nearby bark.
2. Note whether symptoms began at flowers, shoot tips, wounds or the base of the tree.
3. Record bloom timing, rain, hail, freeze events, irrigation changes and recent applications.
4. Check whether neighboring pear, apple, quince or crabapple plants show a similar pattern.

Next steps after a likely diagnosis

Contact a local Extension diagnostic service when a trunk, rootstock, major scaffold or young tree is affected, or when symptoms are ambiguous. Pruning distance and sanitation protocols vary with season and local disease pressure; do not rely on one fixed cut distance for every infection.

Preventive materials must be selected and timed according to the current product label and regional guidance. A bloom-risk model can help with timing; learn how in our prediction-model guide.

Planning future pear plantings

Varieties and rootstocks differ in susceptibility, but none should be treated as immune. Compare current characteristics on individual product pages and browse available pear trees. Match the tree to local climate, chill needs, pollination and site conditions as well as disease considerations.