A-Z Index
Statewide
zzusis
WSU Home
WSU Extension
Hortsense
Hortsense Home
|
Hortsense fact sheets
| Tree Fruits
| Apricot
| Shothole (Coryneum blight)
Apricot
Disease
Bacterial canker
Brown rot
Cytospora canker
Shothole (Coryneum blight)
Silver leaf
Insect
Brown marmorated stink bug
Peach twig borer
Peachtree borer
print version
|
pdf version
|
email url
Caption: Coryneum blight symptoms: shothole, leaf spot, and fruit spot
Photo by: R.S. Byther
Apricot : Shothole (Coryneum blight)
(revision date: 4/11/2018)
Use Integrated Pest Management (IPM) for successful plant problem management.
Biology
Shothole is a fungal disease which attacks leaves, buds, blossoms, fruits, and twigs. Twig cankers are rare on apricot. On apricot, the fungus often infects and kills buds, which may be covered with a shiny, gummy material. Lesions on leaves and fruit are initially small purplish areas which expand into brown spots with light centers. The lesions are seldom larger than 1/4" in diameter. The infected spots on leaves often die and drop out in warm weather, giving leaves a "shothole" appearance. The fungus probably overwinters on the bark and in infected buds. Spores are easily spread by water.
Management Options
Non-Chemical Management
Prune and destroy dead buds and cankered twigs if present.
Rake and destroy infected leaves.
Avoid overhead watering.
Space plantings and prune to provide good air circulation.
Select non-chemical management options as your first choice!
Chemical Management
IMPORTANT:
Visit Home and Garden Fact Sheets for more information on using pesticides
Apply copper fungicides or chlorothalonil products at leaf drop in late fall before heavy rains. Apply IMMUNOX or chlorothalonil products in spring when petals fall. NOTE: Bonide Fung-onil is for spring use only. 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 Liquid Copper Fungicide Conc/Organic Gardening
Active ingredient: copper octanoate | EPA reg no: 67702-2-4
GardenTech Daconil Fungicide Conc
Active ingredient: chlorothalonil | EPA reg no: 67572-82-71004
Monterey Liqui-Cop Copper Fungicidal Garden Spray
Active ingredient: copper-ammonia complex | EPA reg no: 54705-7
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
+ Show larger images
Caption: Coryneum blight symptoms: shothole, leaf spot, and fruit spot
Photo by: R.S. Byther
Caption: Coryneum blight gummy cankers
Photo by: R.S. Byther
Caption: Coryneum blight gummy canker
Photo by: R.S. Byther