Wild Mustard

Pest: Wild mustard (Sinapis arvensis)

Pest Type: Annual Broadleaf Weed

Major Identifying Features: Broad cotyledon that are kidney shaped, broader than long, hairless with a notch at the tip, first true leaves are brighter on top than below, stems are branched and hairless, leaves are toothed and alternately arranged, yellow flowers with branches and 4-petaled, small seeds elliptical to egg shaped, 3.5 feet tall

Life Cycle: Winter annual, reproduces by seed, flowers February to May

Pest Rating: Limited invasiveness

Management Rating: Moderate

Host/Season/Outbreak Information: Grows invasively in disturbed areas such as roadsides or crops rather than in wild lands, does not spread much

Damage Information: Wild mustards can harbor pests and diseases that can damage related crops, roots, leaves, and seeds contain sulfur compounds that can cause thyroid problems in livestock, mustards also can become a fire hazard when they dry up, seeds can survive up to 11 years

Management Options: Mechanical control by manual removal and mowing, cultural control and biological control are NOT advised, chemical control with herbicides WARNING ON THE USE OF CHEMICALS

Sources:

http://www.wric.ucdavis.edu

http://www.ipm.ucdavis.edu

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