Crop weeds

Weeds are estimated to cost Australian agriculture more than $2.5 billion per year. Understanding weeds and the various methods to control them ultimately reduces costs and improves productivity.

The Department of Primary Industries and Regional Development conducts research into the management of weeds and has developed integrated weed management (IWM) packages, that incorporate a number of varied weed control options, including chemical, physical and biological strategies, are vital for sustainable weed management in this state.

Weed populations that have developed herbicide resistance, where standard herbicide treatments are no longer effective, pose an increasing threat to WA's agricultural production.

Articles

  • Windmill grass (Chloris truncata) is a native species and is the tenth most common summer weed species in the Western Australian wheatbelt.

  • Annual ryegrass (Lolium rigidum) is one of the most serious and costly weeds of annual winter cropping systems in southern Australia.

  • Brome grasses (Bromus spp.) are highly competitive weeds, most problematic in wheat crops.

  • Lesser broomrape is the species Orobanche minor. It is an increasingly common weed of pasture and occasionally oat and hay crops. It is also a common garden weed.

  • Herbicides play a vital role in integrated weed management programs.

  • The Weed Seed Wizard is a computer simulation tool that uses paddock management information to predict weed emergence and crop losses.

  • In 2022, the department is conducting more than 300 research trials across the state from Kununurra in the north to Esperance in the south.

  • Hyssop loosestrife (Lythrum hyssopifolia) is a widely distributed weed in the south west of Western Australia.

  • Summer weeds can rob subsequent crops of soil nitrogen and stored soil water. They can also reduce crop emergence by causing physical and/or chemical interference at seeding time.

  • The term 'residual' applies to a number of herbicides that have a long lasting activity in the soil. These herbicides are often applied directly to the soil prior to planting crops, pre-emergent.

Pages

Filter by search

Filter by topic