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Dibotryon Morbosum

Apiosporina morbosa (species), “Black Knot”

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Dibotryon morbosum or Apiosporina morbosa is a plant pathogen, which is the causal agent of black knot. It affects members of the Prunus genus such as; cherry, plum, apricot, and chokecherry trees in North America. The disease produces rough, black growths 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 plum and cherry trees in the late 19th century, today it is relatively well controlled in many cultivated areas and seen primarily in poorly managed orchards, or where strongly established, including in the wild. Many urban centres in North America have black knot control programs. Black knot occurs only on the woody…

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Range Maps show field notes recorded by Natural Atlas contributors and other datasets via GBIF.org

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