When does black knot appear?
When does black knot appear?
Black knot typically starts to appear during spring as temperatures increase. Initial infections can occur during this time when spores are released and spread, particularly following wet, rainy periods. The visible black galls or knots become more noticeable on infected branches and twigs as the growing season progresses, especially by late spring and throughout the summer.
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Scientific Classification
Phylum
Sac fungi Class
Dothideomycetes Order
Venturiales Family
Venturiaceae Genus
Apiosporina Species
Black knot 
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