Publication Date
2022
Publisher
Department of Primary Industries and Regional Development, Western Australia
City
Perth
Abstract
Introducing new plants to an area may have both positive and negative effects on the environment, economy and community. To minimise the negative environmental impact of introducing new agricultural species, DPIRD conducts a risk assessment procedure based on widely accepted scientific standards. This report assesses Perennial ryegrass (Lolium perenne). Perennial ryegrass is a perennial bunchgrass native to Europe, temperate Asia and north Africa. It is one of the most valuable pasture grasses for temperate regions of the world. In south-western Australia perennial ryegrass grows predominantly from the autumn break until late spring but can make useful growth in summer if it receives substantial amounts of out-of-season rainfall or irrigation. Summer growth is restricted by high temperatures (>30°C), even if sufficient moisture is available. Perennial ryegrass has low drought tolerance and a relatively shallow root system. As a result, its role in southern Western Australia (WA) is limited to fertile soils in high rainfall areas (>600mm AAR, 8 month growing season) and irrigated pastures (Sanford 2006). Perennial ryegrass is a cool season grass and is unsuited to northern WA even under irrigation.
Number of Pages
3
Keywords
weed risk, assessment, biosecurity, Western Australia, Perennial ryegrass, Lolium perenne
Disciplines
Biosecurity | Weed Science
Recommended Citation
Department of Primary Industries and Regional Development, Western Australia.
(2022), Lolium perenne - environmental weed risk assessment 2022. Department of Primary Industries and Regional Development, Western Australia, Perth. Report.
https://library.dpird.wa.gov.au/bs_wra/61
