Greater Swinecress

Pest: Greater Swinecress (Coronopus squamatus)

Pest Type: Annual Broadleaf Weed



Major Identifying Features: Low growing and flat, leaves look feathery, many branches, 12 inches long leaves, deeply divided, alternate leaves, forms rosette, flower has four small white flower petals, wrinkly egg shaped seed pots

Life Cycle: Winter or summer annual, sometimes biennial, blooms from May through October, reproduces by seed

Pest Rating: Invasive/”B” noxious

Management Rating: Difficult

Host/Season/Outbreak Information: Grows in alfalfa pastures, vegetable crop fields, orchards, nurseries, gardens, turf, roadsides

Damage Information: Milk from dairy cattle can have an unpleasant flavor if cow eats it, problematic in newly planted alfalfa fields in Sacramento, San Joaquin, and Imperial Valleys

Management Options: Prevention and cultural weed control, chemical control with herbicides (warning with the use of chemical substances!)



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