WSU Extension

Hortsense

Caption: Plum pocket infected fruit
Photo by: R.S. Byther
  
print version| pdf version| email url    

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
    - hide images

+ Show larger images

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