Herbicides for Onion Weed Control

Onion Weed - flowering plantThese herbicide recommendations are made subject to the product being registered for that purpose under relevant legislation. It is the user's responsibility to check that registration or an off-label permit covers the proposed use. Always read the herbicide label.

If in doubt, visit the Australian Pesticides and Veterinary Medicines Authority (APVMA) website at www.apvma.gov.au.

Only herbicides registered for use in pasture and non-cropping situations are listed in the following table. Care must be taken in using herbicides as non-target plants contacted may be harmed. For recommendations in specific crops consult an agronomist.

Care must be taken in using herbicides as non-target plants contacted may be harmed.

Wetting agents

Most herbicides require a wetting agent for best results. Carefully consult the product label for specific directions regarding any adjuvants.

Waterways and wetlands

Be careful! Many herbicides can cause damage to waterways and wetlands. Check the herbicide label directions carefully before use near waterways and wetlands. For more information see Guidelines for Safe and Effective Herbicide Use Near Waterways.

Herbicide brands and concentrations

Herbicides are referred to by the active chemical ingredient in the following table. The product trade names in this publication are supplied on the understanding that no preference between equivalent products is intended and that the inclusion of a product does not imply endorsement by DPIPWE over any other equivalent product from another manufacturer. Information on available brands containing the herbicide you require should be obtained from a reputable herbicide supplier or the APVMA website at www.apvma.gov.au.

There may be a number of products with the same active ingredient some with alternate formulations (concentration) registered for control of a weed eg: Glyphosate 360 g/L, Glyphosate 450 g/L may be registered for use on the same weed. Alternate formulations such as these will have a different application rate. Always check the label.

Foliar application

Stage of Growth
Example of commercial product (concentration of active ingredient)
Application rate of commercial product
Prior to floweringAmitrole + Ammonium ThiocyanateAmitrole T ®
(250 g/L +
220g/L )
1.1 L/100 L waternilApply when weeds are actively growing, immediately prior to flowering.

Respraying will be necessary to destroy regrowth and seedlings
Prior to flowering *Metsulfuron methylBrushoff®
(600 g/Kg)
10-15 g/
nilAPVMA Off-Label permit - PER84775.

Will not affect grasses, will severely damage clovers and other broadleaved plants, including surrounding trees, if contacted by the spray.

Soil-residual, hindering the re-establishment of clovers and other broadleaved plants for 6-12 months.
*Glyphosate(360 g/L)10-13 ml/LnilAPVMA Off-Label permit - PER84775.

Addition of adjuvant required in accordance with label.

Non-selective and will damage or kill trees and grasses that come into contact with spray drift.
* These products are not registered for this use in Tasmania and will not be mentioned on product labels, however Permit Number - PER84775 issued by the Australian Pesticides & Veterinary Medicines Authority allows this specific use. If using this method and herbicide you will require a copy of this off-label permit.

For further information on permit details visit the APVMA website at www.apvma.gov.au.

Important Disclaimer
To the extent permitted by law, the Tasmanian Department of Primary Industries, Parks, Water and Environment (including its employees and consultants) excludes all liability to any person for any consequences, including but not limited to all losses, damages, costs, expenses and any other compensation, arising directly or indirectly from using information or material (in part or in whole) contained on this website.