Payment Form

Enter the payment details and submit

Annual Dues

$125.00

Enter your details below

Spambot blocker question

6 - 4 =

Validating payment information...
Waiting for PayPal...
Validating payment information...
Waiting for PayPal...

UWSA

  • UTAH’S NOXIOUS WEEDS
  • CONTACT US
  • HOME
  • RESOURCES
    • CALENDAR
    • NEWSLETTERS
    • NEWS ITEMS
      • PROJECTS
      • NEWS
      • FEATURE ITEMS
      • SPOTLIGHT
    • UTAH WEED LAW
    • PUBLICATIONS
  • ABOUT US
    • OUR LEADERSHIP
  • FUNDING
    • GRANTS
    • GRANT APPLICATION FORMS
  • NOXIOUS WEEDS
    • UTAH WEED LISTS
    • UTAH WEED LAW
    • WEED FIELD GUIDE
    • NEW INVADERS GUIDE
  • BIOCONTROL
    • UTAH BIOCONTROL
    • BIOCONTROL FIELD GUIDE
    • AVAILABLE AGENTS
PAY ANNUAL DUES

Spotted knapweed

Spotted knapweed

BACKGROUND: Originally found in Eurasia, spotted knapweed infests rangeland, pastures, roadsides, or any disturbed soils. Knapweeds release chemical substances into the soil that inhibit the growth of competing vegetation.

OTHER COMMON NAMES: Centaurea maculosa

DESCRIPTION: Spotted knapweed is a short-lived, herbaceous perennial that is 1 to 3 feet tall. The rosette leaves are deeply lobed and may be 6 inches in length. The stems are moderately leaved. Flowers are typically pink with black-tipped flower bracts. Bloom is in early summer.

CONTROL: Several biocontrol agents are available and offer fair to good control. Select herbicides can offer good to excellent control when applied between rosette and pre-bud stages.

  • SCIENTIFIC NAME: Centaurea stoebe
  • CLASS: 2
  • BIOCONTROL AGENTS AVAILABLE: YES

Related Biocontrol

Larinus minutus

BIOLOGY: Adults are active from May to September. They are…

Cyphocleonus achates

BIOLOGY: C. achates adults emerge from June to September. They…

Search for insects

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

NEW INVADERS GUIDE

Other high priority (Class 1A) noxious weeds

African Rue

BACKGROUND: OTHER COMMON NAMES: DESCRIPTION: TA succulent, highly-branched herbaceous perennial,…

Common Crupina

BACKGROUND: OTHER COMMON NAMES: DESCRIPTION: A winter annual. Common crupina…

Malta starthistle

Malta starthistle

BACKGROUND: OTHER COMMON NAMES: Malta thistle DESCRIPTION: An annual or…

Mediterranean sage

BACKGROUND: OTHER COMMON NAMES: Ethiopian sage DESCRIPTION: A shrubby biennial…

Spring Milletgrass

BACKGROUND: OTHER COMMON NAMES: Spring millet DESCRIPTION: Spring milletgrass is…

Plumeless Thistle

BACKGROUND: OTHER COMMON NAMES: DESCRIPTION: A winter annual or biennial.…

Small Bugloss

BACKGROUND: OTHER COMMON NAMES: Annual bugloss DESCRIPTION: Small bugloss is…

Syrian Beancaper

BACKGROUND: OTHER COMMON NAMES: DESCRIPTION: A rhizomatous woody perennial that…

  • Utah noxious weed law
  • Newsletters
  • Cost Share Funding
  • Contact
  • Leadership

© 2023-2026. All rights reserved.

TOP