WSU Extension

Hortsense

Plum, Prune (Fresh)
 
Disease
Armillaria root rot 
Bacterial canker 
Black knot 
Brown rot 
Crown gall 
Cytospora canker 
Plum pockets 
Russeting 
Shothole (Coryneum blight) 
Silver leaf 
Virus diseases 
Insect
Aphids 
Apple-and-thorn skeletonizer 
Brown marmorated stink bug 
Earwigs 
Fruittree leafroller 
Leafhoppers 
Pacific flatheaded borer 
Peach twig borer 
Peachtree borer 
Pear slug 
Scale insects 
Shothole borer 
Spider mites 
Spotted wing Drosophila (SWD) 



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Caption: Plum pocket infected fruit
Photo by: R.S. Byther
  
Plum, Prune (Fresh) : Plum pockets
(revision date: 5/20/2014)


Biology
Plum pockets is a fungal disease affecting fruit, twigs, and leaves. Infected fruit initially develop small, white spots which rapidly enlarge. The spots later turn reddish to velvety gray. The fruit become distorted, discolored, and much larger than normal. Pits may be absent in the spongy, bladderlike, dark brown fruit. The leathery skin may later become covered with a whitish coating of fungal spores. The fruit later turn dry and hard (mummified). Leaves and twigs show symptoms similar to those of peach leaf curl. Leaves and shoots may be discolored (reddish to yellow) and curled or twisted. The fungus can overwinter on twigs, bud scales, and infected fruit.
Management Options

Non-Chemical Management
  • Plant resistant cultivars. The European plum (Prunus domestica) and the Oriental plum (P. salicina) are reported to be resistant, while American plums (cultivated and wild) are susceptible.
  • Remove infected wild plums in the vicinity.
  • Prune out and destroy infected twigs, branches, and fruit.
  • Rake up and destroy fallen infected fruit.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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