FloraFinder.org
Home   About Us   FAQ  
Searching   Image Use Plant Books
x
FloraFinder uses cookies only for correct operation. More info. Okay

Apiosporina morbosa (Schwein. : Fr.) Arx 1954

Black knot fungus

ParentsUnknownGenus is not in the current taxonomy
GenusApiosporina
Speciesmorbosa

About plant names...

Black knot fungus is a plant pathogen that once severely impacted Prunus species, such as plum and cherry trees. It is native to North America.

Identification: This disturbing looking fungus creates a black, rough, uneven swelling. They are hard and dry to the touch, like charcoal briquets. Although it is well-controlled in most of today’s orchards, I see it quite commonly on wild cherry in New England. The knotty swellings can be ⅞-12″ (2.5-30 cm) in size, wrapping around branches, and they eventually kill the tree.

Online References:

Wikipedia

Hort.extension.wisc.edu

References:

Russo, Ron, Field Guide to Plant Galls of California and Other Western States, University of California Press, 2006, p. 280

Apiosporina morbosa (black knot fungus)

Looks like the infected tree is wild cherry. · 8/15/2015 · Grafton Notch State Park, Newry, Maine · ≈ 6 × 8″ (14 × 20 cm)

Apiosporina morbosa (black knot fungus)

10/25/2009 · Nashua River Rail Trail, Nashua, New Hamp­shire · ≈ 7 × 4½″ (17 × 11 cm)

Apiosporina morbosa (black knot fungus)

11/3/2011 · Pearl Hill State Park, Townsend, Mass­a­chu­setts

Cucurbitaria morbosa (Schwein. : Fr.) Ellis 1881

Dibotryon morbosum (Schwein. : Fr.) Theiss. & Syd. 1915

Sphaeria morbosa Schwein. : Fr. 1822

Botryosphaeria morbosa (Schwein. : Fr.) Sorauer 1921

Plowrightia morbosa (Schwein. : Fr.) Sacc. 1883

Otthia morbosa (Schwein. : Fr.) Ellis & Everh. 1892

 

Apiosporina morbosa description by Thomas H. Kent, last updated 5 Sep 2023.

© FloraFinder.org. All rights reserved.


 

Apiosporina morbosa (black knot fungus)

Looks like the infected tree is wild cherry. · 8/15/2015 · Grafton Notch State Park, Newry, Maine · ≈ 8 × 5″ (19 × 13 cm)

Apiosporina morbosa (black knot fungus)

Looks like the infected tree is wild cherry. · 8/15/2015 · Grafton Notch State Park, Newry, Maine · ≈ 6 × 4″ (16 × 10 cm)

Apiosporina morbosa (black knot fungus)

4/27/2023 · Mitchell Field, Harpswell, Maine

Apiosporina morbosa (black knot fungus)

10/25/2009 · Nashua River Rail Trail, Nashua, New Hamp­shire · ≈ 11 × 7″ (27 × 18 cm)

Apiosporina morbosa (black knot fungus)

10/25/2009 · Nashua River Rail Trail, Nashua, New Hamp­shire · ≈ 7 × 4½″ (17 × 11 cm)