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Cherry
Disease
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)
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: Black knot
Photo by: R. Byther
Cherry : Black knot
(revision date: 6/5/2018)
Use Integrated Pest Management (IPM) for successful plant problem management.
Biology
Black knot is a fungal disease that infects cherry and plum. Early infections of twigs are elongated olive-green, corky knots. They turn black and hard as they mature. Every year they expand lengthwise. It is possible for the fungus to stunt and kill limbs as it grows around the twig or branch.
Management Options
Non-Chemical Management
Remove knots, cutting 3 inches below the knot. Burn or bury infected debris.
Select non-chemical management options as your first choice!
Chemical Management
IMPORTANT:
Visit Home and Garden Fact Sheets for more information on using pesticides
None recommended.
Images
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Caption: Black knot
Photo by: R. Byther