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Canada thistle rust fungus

Puccinia punctiformis

BIOLOGY: P. punctiformis is a naturalized fungus infecting Canada thistle. The rust fungus undergoes four life cycles. Aceiospores emerge in the spring and are visible as yellow fragrant spores on the undersides of leaves. Basidiospores become systemic and damage Canada thistle through summer. Teliospores are brown and fuzzy on the undersides of leaves in the fall.

DESTRUCTIVE STAGE: all

IMPACT TO HOST: Systemic fungal infections can completely kill individual Canada thistle plants. Fungus do not spread well on their own. Management like mowing or grazing will increase impact.

REDISTRIBUTION: Collect leaves infested with teliospores and release in new Canada thistle. Spores must come in direct contact with rosettes for successful establishment.

  • SCIENTIFIC NAME: Puccinia punctiformis
  • COMMON NAME: Canada thistle rust fungus
  • TYPE OF AGENT: Fungus
  • GENERATIONS PER YEAR:
  • OVERWINTERING STAGE: Urediniospores (systemic)
Puccinia punctiformis
Puccinia punctiformis
Puccinia punctiformis plant

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Contact us with questions

Utah Biological Control

Amber Mendenhall

phone: 435 830 4146

email: utahsbuggirl@gmail.com

Utah Noxious Weeds

contact your local County Weed Supervisor

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