Italian Ryegrass

Pest: Italian Ryegrass (Lolium multiflorum), Annual Ryegrass

Pest Type: Weed, grass

Major Identifying Features: Seedling leaves are shiny, grow about 3 feet tall, stems grow singly or in clumps, leaf blades are flat, glossy, hairless, and 2-10 inches long, 1/10 to 2/5 of an inch wide, well developed auricles, flowering from April to September, flowerhead is 3-12 inches long

Life Cycle: Winter annual or biennial that behaves as a short-lived perennial

Pest Rating: Moderate

Management Rating: 

Host/Season/Outbreak Information: Ryegrass is found in California up to 3300 feet elevation, except in deserts and and the Great Basin, can be found in agricultural areas and other disturbed areas

Damage Information: Grows vigorously, competes with nutrients

Management Options: Prevention, mulching, hoeing, hand-weeding, spot application with herbicide


Dreistadt, Steve H., and Jack Kelly. Clark. Pests of Landscape Trees and Shrubs: An Integrated Pest Management Guide. Oakland, CA: U of California, Division of Agriculture and Natural Resources, 1994. Print.

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