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Ophiostoma ulmi (Buisman) Nannf.
DUTCH ELM DISEASE
Life   Fungi   Ascomycota   Ophiostomataceae   Ophiostoma


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Copyright © 2008 Jordan Zachritz (DrMcTreemie1) Version: 4
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First person to use this name on MO: Jordan Zachritz

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Nomenclature:

Rank: Species

Status: Accepted

Name: Ophiostoma ulmi

Author: (Buisman) Nannf.

Citation: in Melin & Nannfeldt, Svensk Skogsvårdsförening Tidskr., Hafte 32(3-4): 408 (1934)

Classification:

Kingdom: Fungi

Phylum: Ascomycota

Class: Sordariomycetes

Order: Ophiostomatales

Family: Ophiostomataceae

Genus: Ophiostoma

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Lifeform: Brief Description: See More | Edit

Ophiostoma ulmi is an Ascomycetous wilt pathogen of Ulmus spp. It was first described as a Ceratocystis by Dutch scientists in Holland in 1918 2 . It moved fast through Europe to Great Britain by 1927 and to the United States in 1930, with a second introduction to Canada in 1945. The fungus is a disease agent of the vasculature, causing the secretion of tyloses within the vessels as a reaction to the toxin, cerato-ulmin 1 . Dutch Elm Disease enters trees by means of an insect vector, Scolytus multistriatus (the European elm bark beetle) and Hylurgopinus rufipes (the native North American elm bark beetle) 1 , 2 , 3 , 4 . It may also pass through the grafted roots of elm trees in close proximity. The lifecycles may be viewed in multiple places: APS and Cornell .

The fungus produces long-necked ostiole, black perithecia 1 , which contain neither paraphyses nor periphyses. These perithecia have lost the ability to actively discharge and contain deliquescing asci. Ascospores mass at the top of the ostiole and form a sticky drop. The conidia are also sticky and are produced on appressed conidiophores, forming a coremium or synnema . Both of perithecia and coremia develop within the beetle galleries of the insect vector and stick to the insects as they feed and develop. The spores and conidia are transmitted with the mycangia, specialized pits within the roofs of the beetles mouths 1 . A yeast-like mitospore may also be produced within the host’s vasculature, this is named Sporothrix 1 .
See observation 14288 for perithecia with characteristic ostiole.
See observation 14946 for wilting symptoms.

Descriptions: [ Create ] Public Description (Default)   [ Edit ] Draft For 2008/2009 Eol University Species Pages Initiative By Jordan Zachritz (Private)

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Created: 2008-11-13 00:14:32 CST (-0600) by Jordan Zachritz (DrMcTreemie1)
Last modified: 2010-04-07 19:41:40 CDT (-0500) by Jordan Zachritz (DrMcTreemie1)
Viewed: 1973 times, last viewed: 2017-09-22 08:59:54 CDT (-0500)
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