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Class B Noxious Weed

White Bryony
Bryona alba
 


 Plant family: Cucurbitaceae
Year listed:
Native to: Europe

Why is it a noxious weed?

Bryony is a vigorous perennial vine resembling Kudzu in its habit -- forming dense mats which shade out all vegetation it grows upon. Major destructive potential to native vegetation, forest communities, and urban horticulture. Berries are toxic to humans.

How would I identify it?
General Description:  White bryony is an herbaceous perennial vine, 12 feet long, or more. The thick root is a light yellow. Long curling tendrils, flowers and fruit are from leaf axils. White bryony is monoecious, male and female flowers are found on the same plant.

Leaves:

  • simple
  • triangular
  • alternate
  • broadly toothed
  • upper and lower surfaces have small white glands

Flowers:

  • greenish-white to 1/2 inch across

Stems:

  • vine

How does it reproduce?
White bryony reproduces by seed.

Where does it grow?

It generally occurs as a climber in trees and fence rows but when disseminated in an area where there is nothing to climb, it will form dense mats shading out all other vegetation.

What is the distribution in Washington State?

 

 

 

Click on map to enlarge.
  • White bryony has been documented in Franklin, Walla Walla, Columbia, Garfield and Whitman counties.
  • Distribution map is based on 2003 data.

How do I control it?

General control methods: Information not available at this time.

Cultural: Information not available at this time.

Herbicide: Please refer to the PNW Weed Management Handbook, or contact your county noxious weed coordinator.

Mechanical: Information not available at this time.

Biological: Information not available at this time.

For more information
For more information, download our Written Findings.

 

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    White bryony infestation.      

 Last updated September 10, 2008