Pear Tree Leaf Problems: Spots, Rust, Curling and Stress

Pear leaves can spot, curl, yellow or scorch for many reasons. Start with the symptom pattern and the part of the tree affected before choosing a response. A fungicide, oil or nutrient product will not correct every leaf problem.

Quick symptom guide

• Dark, expanding leaf spots: consider pear scab or Fabraea/Entomosporium-type leaf spot, depending on region and whether fruit or twigs are also marked.
• Bright orange spots: pear rust is likely; many pear rusts alternate with juniper relatives.
• Raised blisters that change from green or pink to brown: consider pear leaf blister mite.
• Sticky honeydew, sooty growth or curled new leaves: inspect for pear psylla or aphids.
• Interveinal yellowing or uniform pale leaves: investigate root function, soil pH, water management and nutrient availability before fertilizing.
• Brown margins or scorched areas: check irrigation, heat, salt exposure, wind and root injury.
• Blackened shoots with attached leaves: use the pear fire-blight guide; this is more than a leaf-spot problem.

Dark spots: scab and leaf-spot diseases

Note spot color, edge, texture and distribution. Pear scab may produce olive to dark lesions on leaves and fruit. Other leaf-spot diseases can create purple-brown lesions, premature defoliation and fruit spotting. Collect fallen leaves where recommended, improve airflow without over-pruning, and avoid unnecessary foliage wetting. Confirm the pathogen locally before selecting a fungicide program.

Orange spots: pear rust

Rust lesions are often vivid orange or rust-colored and may develop unusual structures later in the season. Because alternate hosts and rust species vary by region, nearby junipers are a clue rather than proof. Ask local Extension which rust occurs in your area and whether host separation is practical.

Blisters and curling: mites or sap-feeding insects

Pear leaf blister mites feed within leaf tissue and can produce raised, discolored blisters. Pear psylla and aphids are more likely to occur on tender growth and may leave honeydew. Inspect with a hand lens and check both leaf surfaces before acting.

Yellowing, scorch and premature drop

Check soil moisture at root depth, irrigation coverage, drainage, trunk injury and root-zone competition. Consider soil or tissue testing when a nutrient problem is suspected. Leaf color alone is not enough to prescribe a fertilizer.

Before using a treatment

1. Identify the likely pest, disease or stress.
2. Confirm that treatment is needed; cosmetic damage may not justify an application.
3. Use only a product whose current label lists pear and the target problem.
4. Follow label timing, rate, PPE, re-entry, preharvest and mixture directions.
5. Use local Extension guidance for regional disease cycles and resistance management.

Support long-term pear health

Match irrigation to soil and weather, protect the trunk and root zone, prune for sound structure, and remove disease reservoirs when locally recommended. Browse current pear trees and use each product page for offered variety characteristics.