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How to Manage Pests

Identification: Weed Photo Gallery

Italian ryegrass

Scientific name: Lolium multiflorum (Grass Family: Poaceae)

Life stages of Italian ryegrass inflorence collar Italian ryegrass in turfgrass

Click on image to enlarge

DESCRIPTION:
Italian ryegrass, also called annual ryegrass, is an upright annual grass that behaves like a biennial or short-lived perennial. It grows vigorously in winter and early spring. The hairless cotyledon (seed leaf) is shiny. Flat blades have a short, membranous ligule. Auricles are variable in size, clasping or blunt. The mature plant grows 1 to 4 feet (30 - 120 cm) tall. Flower clusters are usually spikelike but occasionally branch off the main axis. Small stalkless flower subunits alternate with one another along the axis. Long bristles on the individual flowers and at least 10 flowers per flower unit are characteristics that differentiate Italian from perennial ryegrass.

Grass ID illustration.


Statewide IPM Program, Agriculture and Natural Resources, University of California
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For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See How to manage pests, or in the U.S., contact your local Cooperative Extension office for assistance. /PMG/WEEDS/italian_ryegrass.html revised: November 17, 2008. Contact webmaster.