Bark Loss on Ornamental Pear Trees in Cold Climates

Two 6-year-old ornamental pear trees (likely Pyrus calleryana 'Bradford' or similar) in the Catskill foothills of New York show severe bark loss—one has lost ¾ of its circumference, the other is drying. No insects, discoloration, or wounds are visible. The area had excessive summer rain. The owner fears the trees will die once girdling is complete.

Ornamental pears are notorious for structural weaknesses and bark issues. Common causes of bark separation include:

• Frost cracking: Rapid temperature swings freeze and expand sap, splitting bark—common in thin-barked species on sunny winter days.
• Sunscald: Winter sun warms bark, activating cambium; sudden freeze kills tissue.
• Waterlogging: Excessive rain saturates soil, reducing root oxygen and causing canopy dieback and bark sloughing.
• Canker diseases (Botryosphaeria, Nectria): Enter through minor wounds, kill cambium, and cause bark to separate—often without visible fungal signs early on.
• Root girdling: Circling roots from container production strangle the trunk base over time.

These trees are generally short-lived (15–25 years) and prone to storm breakage. Given the extent of damage, recovery is unlikely. Contact your Cornell Cooperative Extension office for on-site diagnosis. They can confirm the cause and recommend replacement species better suited to the site—such as serviceberry (Amelanchier), Japanese tree lilac (Syringa reticulata), or disease-resistant crabapples.