WSU Extension


Armillaria root rot 
Bacterial canker 
Black knot 
Brown rot blossom blight and fruit rot 
Crown gall 
Cytospora canker 
Dead bud 
Gumming (Gummosis) 
Leaf spot 
Little cherry 
Mottle leaf 
Necrotic rusty mottle 
Powdery mildew 
Prunus necrotic ringspot 
Shothole (Coryneum blight) 
Verticillium wilt 
Witches'-broom (Cherry leaf curl) 
Apple-and-thorn skeletonizer 
Black cherry aphid 
Brown marmorated stink bug 
Cherry bark tortrix 
Cherry fruit fly 
Cutworms and armyworms 
Peachtree borer 
Pear slug (Cherry slug) 
San Jose scale 
Shothole borer 
Spider mites 
Spotted wing Drosophila (SWD) 

print version| pdf version| email url    
Caption: Cherry gummosis
Photo by: R.S. Byther
Cherry : Gumming (Gummosis)
(revision date: 5/20/2014)

Gumming of cherry can be caused by several factors. It can be a physiological reaction to unfavorable growing conditions. Trees growing in damp conditions often produce gum, as do trees which have received excess water or nitrogen fertilizer (causing a sudden growth spurt). The gum often runs down branches or trunks, or may collect in branch crotches. Injuries often induce gumming, as well. Sunscald and mechanical injuries can be at fault. Gumming is also associated with cankers caused by diseases such as brown rot, bacterial canker, or Cytospora canker.
Management Options

Non-Chemical Management
  • Provide proper culture to maintain a steady growth rate. Avoid over-fertilization or other practices which produce large amounts of soft growth or sudden growth spurts.
  • Control diseases which cause gumming.
  • Prune or cut out disease cankers.
  • Prevent injury to trunks and branches when possible. Sunscald can be prevented by shading or whitewashing trunks.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


+ Show larger images

Caption: Cherry gummosis
Photo by: R.S. Byther