Ornamental Plum: Plum pockets

categories: Ornamental Plum Ornamental Plum Diseases Ornamental trees Ornamentals

revision date: 2022-11-28 12:00

Plum pocket infected fruit.
Plum pocket infected fruit
Photo by: R.S. Byther


Plum pockets is caused by a fungal infection of the leaves, twigs, and small branches. The fungus overwinters on twigs or bud scales. Infection occurs on young plant parts in the spring. The affected plant parts are distorted and swollen, with leaves often developing a yellowish to reddish color and blister-like distortions. Fruits (if produced) are also affected, becoming swollen, spongy, and yellow to dark brown or black in color, then turning dry and hardened (mummified). Mummified fruits serve as another source of infection.

Management Options

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

Non-chemical Management

Select non-chemical management options as your first choice!

  • Prune and destroy all infected tissues.
  • Clean up and destroy all fallen fruit from beneath trees. Also remove fruit or leaves that remain on the tree into the winter.

Chemical Management

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

  • Apply during the winter dormant season.
  • 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.