WSU Extension

Hortsense

Ornamental Plum
 
Disease
Armillaria root rot 
Brown rot 
Crown gall 
Cytospora canker 
Plum pockets 
Shothole (Coryneum blight) 
Silver leaf 
Viruses 
Insect
Hop aphid 
Leaf curl plum aphid 
Peachtree borer 
Pear slug 
Scales 



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Caption: Plum pocket infected fruit
Photo by: R.S. Byther
  
Ornamental Plum : Plum pockets
(revision date: 1/22/2016)


Biology
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


Non-Chemical Management
  • 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.
Select non-chemical management options as your first choice!

Chemical Management

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.

Listed below are examples of pesticides that are legal in Washington. Always read and follow all label directions.
  • Bonide Liquid Copper Fungicide Conc/Organic Gardening
    Active ingredient: copper octanoate  |  EPA reg no: 67702-2-4
  • This list may not include all products registered for this use.
Images

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