No Common Name Biscogniauxia atropunctata (Schweinitz) Pouzar    Synonyms: Biscogniauxia Canker and Dieback disease, Hypoxylon atropunctata, Hypoxylon Canker, Hypoxylon Canker of Oak.
Kingdom Fungi   >   Phylum Ascomycota   >   Class Sordariomycetes   >   Order Xylariales   >   Family Xylariaceae   >   Genus Biscogniauxia   

Status:

Biscogniauxia atropunctata is a fungus that attacks hardwoods and causes the Hypoxylon Canker of Oak or Biscogniauxia Canker and Dieback disease, which often causes death to an infected tree. According to the Oklahoma State University Cooperative extension, "The fungus colonizes healthy trees and lives in the bark and sapwood for an indefinite period of time without causing damage. In healthy trees, natural defenses are typically present that prevent the fungus from causing disease. When the tree becomes stressed, its defenses are reduced and the tree can no longer resist the fungus. Stress factors include drought, heat, root damage, chemical injury and other diseases. Trees that are attacked by defoliating insects are also more likely to develop Biscogniauxia dieback."

Description:

Gray-white smooth sheet with black dots (J. Solem, pers. comm.).

Relationships:

According to the Oklahoma State University Cooperative extension, "Although all oak species are susceptible, the disease is more frequently observed on the red oak subgroup...Biscogniauxia canker and dieback can be found on maple, hickory, Pecan, Goldenrain Tree and sycamore (Platanus spp.)"

There are 194 records in the project database.

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Biscogniauxia atropunctata in Montgomery Co., Maryland (9/20/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC). Photo by Emily Summerbell, Ph.D. via iNaturalist. (MBP list)

Biscogniauxia atropunctata found during the Chino Farms BioBlitz (4/27/2013). Identified by Lance Biechele. Anamorph of Diaptera stigma. Photo by Bill Hubick. (MBP list)

Biscogniauxia atropunctata in Worcester Co., Maryland (5/19/2013). Photo by Jim Brighton. (MBP list)

Biscogniauxia atropunctata in Anne Arundel Co., Maryland (12/5/2016). Photo by Bill Hubick. (MBP list)

Biscogniauxia atropunctata in Howard Co., Maryland (12/17/2011). Determined by Jo Solem. Photo by Nancy Magnusson. (MBP list)

Biscogniauxia atropunctata in Charles Co., Maryland (5/18/2014). Photo by Jim Brighton. (MBP list)

Biscogniauxia atropunctata (fruiting body) in Howard Co., Maryland (8/22/2016). Photo by Joanne Solem. (MBP list)

Biscogniauxia atropunctata in Frederick Co., Maryland (2/15/2020). (c) emilio c, some rights reserved (CC BY-NC). Photo by Emilio Concari. (MBP list)

Biscogniauxia atropunctata in Allegany Co., Maryland (4/8/2017). Photo by Bill Hubick. (MBP list)

Biscogniauxia atropunctata in Washington Co., Maryland (4/20/2014). Photo by Jim Brighton. (MBP list)

Biscogniauxia atropunctata in Prince George's Co., Maryland (10/16/2020). (c) herpherphooray, some rights reserved (CC BY-NC). Photo by herpherphooray via iNaturalist. (MBP list)

Biscogniauxia atropunctata in Prince George's Co., Maryland (3/29/2019). Determined by Jo Solem. Photo by Anne Looker. (MBP list)

Biscogniauxia atropunctata spores collected in Howard Co., Maryland (8/22/2016). Ellipsoid w/ rounded ends & germ slit down side, smooth, dark brown; measured 25.5-30.2 X 13.2-15.3 microns. Photo by Robert Solem. (MBP list)

Spores of Biscogniauxia atropunctata in Howard Co., Maryland (8/22/2016). (c) Joanne and Robert Solem, some rights reserved (CC BY-NC). Photo by Joanne Solem. (MBP list)

Biscogniauxia atropunctata in Montgomery Co., Maryland (9/20/2020). (c) Emily Summerbell, some rights reserved (CC BY-NC). Photo by Emily Summerbell, Ph.D. via iNaturalist. (MBP list)

Biscogniauxia atropunctata in Baltimore Co., Maryland (1/2/2021). (c) Jim Brighton, some rights reserved (CC BY-NC). Photo by Jim Brighton. (MBP list)

Biscogniauxia atropunctata in Montgomery Co., Maryland (2/17/2020). (c) Izabella Farr, some rights reserved (CC BY-NC). Photo by Izabella Farr via iNaturalist. (MBP list)

Biscogniauxia atropunctata in Calvert Co., Maryland (4/21/2019). (c) Mitch, some rights reserved (CC BY-NC). Photo by Mitch via iNaturalist. (MBP list)

Biscogniauxia atropunctata in Montgomery Co., Maryland (2/17/2020). (c) Izabella Farr, some rights reserved (CC BY-NC). Photo by Izabella Farr via iNaturalist. (MBP list)


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