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Dibotryon morbosum

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Title: Dibotryon morbosum  
Author: World Heritage Encyclopedia
Language: English
Subject: Apricot
Collection: Fungal Tree Pathogens and Diseases, Stone Fruit Tree Diseases, Venturiaceae
Publisher: World Heritage Encyclopedia

Dibotryon morbosum

Dibotryon morbosum
Black Knot on Cherry
Scientific classification
Kingdom: Fungi
Phylum: Ascomycota
Subdivision: Pezizomycotina
Class: Dothideomycetes
Order: Pleosporales
Family: Venturiaceae
Genus: Dibotryon
Species: D. morbosum
Binomial name
Dibotryon morbosum
(Schwein.) Theiss. & Syd., 1915

Dibotryon morbosum or Apiosporina morbosa is a plant pathogen, which is the causal agent of black knot.[1][2] It affects the cherry, plum, apricot and Shubert chokecherry trees of North America. The disease produces rough, black areas that encircle and kill the infested parts, and provide habitat for insects.

The disease was first described in 1821 in Pennsylvania but has spread across North America. While it was one of the most destructive diseases of the plum and cherry trees in the late 19th century, today it is relatively well controlled and only seen in poorly managed orchards or where strongly established.

Black Knot occurs only on the wood parts of trees, primarily on twigs and branches but can spread to larger limbs and even the trunk. Olive-green swellings from the disease are visible in the late spring, but as it spreads and matures typically by autumn rough black knots circle and kill affected parts. The knots vary in size from one inch to one foot (2.5 cm - 30 cm). Older knots can kill trees by promoting insect infestations.

The most common treatments are pruning infected parts during the winter and spraying buds with a fungicide. Nearby wild plants with the disease are also destroyed.


  1. ^ Apiosporina morbosaBlack Knot, at West Virginia University
  2. ^ Apiosporina morbosaDistribution map of at European and Mediterranean Plant Protection Organization

External links

  • Index Fungorum entry
  • USDA ARS Fungal Database
  • West Virginia University Black Knot page
  • Ohio State University Extension, Black Knot Fact Sheet
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