Bristly Oxtongue

Pest: Bristly Oxtongue (Picris echioides)

Pest Type: Annual broadleaf weed, grass

 

Major Identifying Features: Erect, cotyledons are broadly stalked, oval to egg shaped, hairless, alternate leaf arrangement, later leaves are lager, grow 3-1/3 feet tall and have milky sap, coarse stems, yellow flower heads resemble dandelions

Life Cycle: Winter and/or summer annual, reproduces by seed, flowers from September to October

Pest Rating: Moderate

Management Rating: Moderate

Host/Season/Outbreak Information: Widespread in California up to 1500 feet except the Great Basin, grows on agricultural land and disturbed areas

Damage Information: Can form dense stands in rangelands and other areas near coastal grasslands

Management Options: Mechanical by pulling, cutting, disking, cultural by burning, chemical control (little information available)

Sources:

http://www.ipm.ucdavis.edu

 

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