WSU Extension

Hortsense

Cherry
 
Disease
Armillaria root rot 
Bacterial canker 
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) 
Insect
Apple-and-thorn skeletonizer 
Black cherry aphid 
Brown marmorated stink bug 
Cherry bark tortrix 
Cherry fruit fly 
Cutworms and armyworms 
Earwigs 
Leafrollers 
Peachtree borer 
Pear slug (Cherry slug) 
San Jose scale 
Shothole borer 
Spider mites 
Spotted wing Drosophila (SWD) 



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Caption: Armillaria root rot infecting trunk
Photo by: C.R. Foss
  
Cherry : Armillaria root rot
(revision date: 5/20/2014)


Biology
Armillaria root rot is a fungal disease often found in newly cleared soils or soils which have been flooded. Aboveground symptoms typically include production of smaller-than-normal leaves, leaf yellowing, premature leaf drop, and branch dieback, often on only a portion of the tree. White thread-like masses of the fungus may be found beneath the bark near the crown of infected trees, and/or as shoestring-like rhizomorphs, which are dark strands of the fungus growing on or just beneath the soil surface. Honey-colored mushrooms often grow near the base of infected trees in the fall. Infected trees may also exhibit a dark black line in the infected area encircling the base of the plant. Trees damaged by human activity such as construction or improper irrigation are more susceptible.
Management Options

Non-Chemical Management
  • Use resistant rootstocks. Mazzard rootstocks are reported to be moderately resistant after they are well established.
  • Provide proper culture. Healthy plants are more resistant to infection.
  • Remove damaged trees if necessary. When possible, remove roots 1" or more in diameter and air-dry soil before replanting.
  • Avoid injury to roots and trunk.
  • Plant resistant species in infected areas. Lists are available in the PNW Plant Disease Management Handbook and the Sunset Western Garden Book, or contact your county Extension agent or WSU Master Gardeners.
Select non-chemical management options as your first choice!

Chemical Management

None recommended

Images

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Caption: Armillaria root rot infecting trunk
Photo by: C.R. Foss
Caption: Armillaria root rot infecting trunk
Photo by: R.S. Byther
Caption: Cherry Armillaria root rot
Photo by: R.S. Byther
Caption: Armillaria rhizomorphs
Photo by: R.S. Byther