Weeds - Grass Weeds Information and Photo Gallery

Italian rye-grass

(See as Meadow Fescue)

Weeds_rirye.jpg (5978 bytes)


Italian rye-grass (Lolium multifloram Lam.) is an annual to biannual, tufting grass that grows 30 to 100 cm high. The leaf blades are hairless and very glossy. The flower spikes are large and flowering occurs in the early summer. The individual blades are 4 to 7 mm wide and 10 to 40 cm long. They are a soft, bright green in colour. The upper surface tends to be dull and ridged whilst the lower surface is glossy and smooth. It is a valuable fodder grass.

Occurrence and spread

Italian rye-grass is frequently found in field margins and on waste ground. It prefers fertile soils. Italian ryegrass is spread primarily by seed. It flowers from June to August.

Control and management

Management practices to reduce seed spread will greatly decrease ryegrass problems. Such practices could include: cleaning equipment from field to field (especially those fields heavy in ryegrass), maintaining clean fence rows and ditch banks surrounding the fields, and avoiding those fields with heavy ryegrass populations.

Unless the field has a history of heavy ryegrass infestation, an early post-emergence herbicide application will be the most cost-effective treatment. When the ryegrass is small (1 to 3 leaves), lower rates of a herbicide should provide good control. However, larger ryegrass plants will require a higher dosage and, in many cases, control will not be complete.

Economic control threshold is approximately 2 plants every 1 square metre. Seek advice from your BASIS qualified adviser.

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