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: Brown rot blossom infection
Photo by: R.S. Byther
  
Cherry : Brown rot blossom blight and fruit rot
(revision date: 1/22/2016)


Biology
Brown rot is a blossom-infecting fungal disease. Infected flowers wilt and die. The brown blossoms remain attached to the twigs, becoming covered with a grayish-brown fungal growth during wet weather. Blossom or fruit infections may spread to twigs. Infected twigs develop sunken, elongate cankers with gumming at the margins. Leaves on girdled shoots turn brown and remain attached. Infected fruit initially show a small brown spot which rapidly enlarges. The fruit remains fairly firm and often becomes covered with gray-brown fungus. Fruit may dry and harden into mummies, which serve as a source of infection in the spring.
Management Options

Non-Chemical Management
  • Remove mummified fruit in the tree or under the tree to reduce spread of disease.
  • Prune out infected twigs in late spring or summer. Do not wait until the dormant season, when infected twigs are difficult to distinguish.
  • Space plantings and prune to provide good air circulation. This will reduce moist conditions which favor disease development.
  • Avoid overhead watering.
  • Control insects that cause wounds and provide infection sites for the fungus.
  • Avoid wounding fruit during harvest.
Select non-chemical management options as your first choice!

Chemical Management

Apply fungicides just before blossoms open. Make additional applications at full bloom, and when most or all of the blossom petals have fallen. Do not use sulfur products during bloom west of the Cascades. Do not apply copper fungicides after full bloom. 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 Fung-onil Multi-Purpose Fungicide Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 60063-9-4
  • Bonide Infuse Systemic Disease Control
    Active ingredient: propiconazole  |  EPA reg no: 100-773-4
  • Bonide Sulfur Plant Fungicide Micronized Spray or Dust RTU [Organic]
    Active ingredient: sulfur  |  EPA reg no: 4-62
  • Hi-Yield Snake Eyes Dusting Wettable Sulfur
    Active ingredient: sulfur  |  EPA reg no: 7401-188-34911
  • Lilly Miller Sulfur Dust Fungicide/Insecticide Dust or Spray
    Active ingredient: sulfur  |  EPA reg no: 802-16
  • Ortho Max Garden Disease Control Conc
    Active ingredient: chlorothalonil  |  EPA reg no: 239-2522
  • Spectracide IMMUNOX Multi-Purpose Fungicide Spray Conc
    Active ingredient: myclobutanil  |  EPA reg no: 9688-123-8845
  • This list may not include all products registered for this use.
Images

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Caption: Brown rot blossom infection
Photo by: R.S. Byther
Caption: Dead blossoms and gumming from brown rot infection
Photo by: R.S. Byther
Caption: Flagging symptoms from brown rot infections
Photo by: R.S. Byther
Caption: Brown rot infected fruit
Photo by: R.S. Byther