Poplar: Leaf blister

categories: Ornamental trees Ornamentals Poplar Poplar Diseases

revision date: 2024-06-05 02:07

Poplar leaf blister symptoms.
Poplar leaf blister
Photo by: R.S. Byther


Leaf blister is a fungal disease which infects the leaves of poplars. Leaves develop small to large yellow-green blisters or mounds on the upper surface. Severely infected leaves may be distorted. The undersides of the blisters develop a golden-yellow powdery or velvety coating or “bloom” which later turns brown. In early stages, the yellow bloom may be confused with rust. Rust, however, lacks the distinct, thickened, blistered areas common to leaf blister. Infection occurs following cool, wet weather in the spring. Infected leaves seldom drop. Although unsightly, leaf blister causes little real damage to trees.

Management Options

Use Integrated Pest Management (IPM) for successful plant problem management.

Non-chemical Management

Select non-chemical management options as your first choice!

  • Pick out and destroy severely infected leaves, if desired, to improve appearance of small trees.

Chemical Management

IMPORTANT: Visit Home and Garden Fact Sheets for more information on using pesticides.

  • Research data on controlling leaf blister is lacking.
  • The disease is similar to peach leaf curl.
  • Three sequential fungicide applications beginning January 1st and given at 3- to 4-week intervals may provide some control.
  • Homeowners should not make foliar applications to trees over 10 ft tall.
  • Consult a commercial pesticide applicator for treatment of trees and shrubs over 10 ft. tall.

Approved Pesticides

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.