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Biocontrol of Yellow Toadflax using Rhinusa pilosa, in Prince Albert National Park

Yellow toadflax is a widely distributed perennial invasive plant that reproduces by seed and extensive creeping rhizome. The plant is extremely hardy and  has the ability to densely infest large areas and crowd out native vegetation, making it a threat to ecological integrity in Prince Albert National Park. Herbicide spraying of yellow toadflax has occurred in several locations in Prince Albert National Park with limited success. Using a biological control agent offers an additional option for control of this species in a manner that is not nearly so labour intensive.  Prince Albert National Park will be working with Agriculture and Agri-food Canada to carry out trials of Rhinusa pilosa in up to three affected locations - Prospect Point, Rabbit Cabin area and 12 Mile Meadow. Weevils will be obtained from Agriculture and Agri-foods Canada at no charge and will be released at the sites in late summer.


This map is for illustrative purposes. The markers represent the approximate locations based on available data. More than one marker may be identified for a given assessment.


Latest update

27 february 2020 – The public comment period on the project is closed. Parks Canada is considering comments received to help inform its determination on whether the carrying out of the project is likely to cause significant adverse environmental effects.

Key documents

Key documents
Document Number Document Title File Date
1 New project being assessed by Parks Canada - Public comments invited from 27 january to 26 february 2020 - January 27, 2020

List all records


Prince Albert National Park
Box 100
Waskesiu Lake, SK S0J 0N0
Telephone: 306-663-4522 or 1-888-773-8883

  • Location

    • Prince Albert National Park (Saskatchewan)
  • Project Type

    • Remediation and conservation
  • Status

    In progress
  • Start Date

  • Proponent

    Parks Canada
  • Authorities

    • Parks Canada Agency
  • Assessment Type

    Project on federal lands
  • Reference Number


Nearby projects

..within 200 kilometres
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