Broad weed resources are outlined in the Agronomists Toolkit.

Weed competition

Weed competition

  • Weeds can compete with the growing canola crop for nutrients, water, space, and sunlight


  • If weeds are resistant to herbicides, prolific, or invasive, the yield penalty can be large


Application of herbicides, integrated weed management, and cultural practices can all contribute to the successful management of weed populations.

Links and Resources

AOF - Canola weed management

Comphrehensive 7 page PDF on Canola weed management. 


Australian Government - Weeds in Australia.

Comprehensive website offering information on about weeds, weed management, how you can help, and identifying weeds. Page last updated 2015.

CSIRO - Competitive ability of Australian canola (Brassica napus) genotypes for weed management

11 page PDF. Scientific paper investigating the competitive ability of Australian canola for weed management. Published 2014.

DAFWA - Weed control in non GM canola

4 page farm note. Introduction, weed management, timing of herbicides, and herbicide residues. Published 2010.

DEPI VIC - Weeds.

Comprehensive website offering information on state prohibited weeds, cost to agriculture, a-z of weeds, invasive plant classifications, invasive plant manageement, and weed spotters, As well as links to furtherpages of information. Page last updated 2015.

GRDC - Best Practice Management Guide. Weeds

Section 8. Pages 41-46. Introduction, herbicide management of weeds, species and optimum spraying times, herbicide tolerant canola types, Integrated Weed Management, and cultural practices. Published 2009.

GRDC - Integrated Weed Management Hub.

Comprehensive website with information on herbicide resistance, agronomy, managing weed seedbank, managing weed seedlings, stopping weed seed set, managing weeds at harvest,managing farm hygiene, profile of common cropping weeds, case studies, and links to further information and scientific papers. Last updated 2015.

NSW DPI - Weedwise

NSW Weedwise. Over 300 noxious and environmental weeds, with accompanying high quality images. 

PIRSA - Weeds and Pest Animals in South Australia.

Website containing information on weeds in South Australia, declared plant list, alert weeds, weeds of national significance, report a weed, and weed control app. Page last updated 2015.   ...

Weed Smart - Choose a highly competitive canola crop

Article detailing latest research into competitive canola crops. Published 2015.

Weeds Australia - National initiative.

National initiative website with information on Australian weeds strategy, invasive plants and animals, weeds of national significance, weed identification and information, traning and materials, noxius weeds, weed management, and contacts. Updated 2015.