Moderate resistance risk
Globally, herbicide resistance to the Group Q herbicide mode of action has been confirmed and documented in 7 weed species across 4 countries.
Group Q resistance exists in Australia with 3 populations of annual ryegrass resistant to amitrole. This has only occurred in 3 populations and this type of resistance is rare in Australia.
To assist in delaying the onset of resistance, consider alternating Group Q herbicides with herbicides from other modes of action, such as Group L (eg paraquat), Group N (eg glufosinate) or Group M (eg glyphosate).
Consider using alternative methods of weed control to reduce weed numbers before applying herbicides.
The above recommendations should be incorporated into an Integrated Weed Management (IWM) program. In all cases try to ensure surviving weeds from any treatment do no set and shed viable seed. Keep to integrated strategies mentioned in this brochure including rotation of mode of action groups. Make sure you rotate between products from different mode of action groups. Always consult the product label prior to use.
CHEMICAL FAMILY ACTIVE CONSTITUENT (FIRST REGISTERED TRADE NAME)
GROUP Q Bleachers: Inhibitors of carotenoid biosynthesis unknown target
Isoxazolidinones: clomazone (Altiplano®*, Command®)
Triazoles: amitrole (Alliance®*, Amitrole®, Brunnings RTU Pathweeder®*,Illico®*, Firestorm®*, Yates Onceyear Pathweeder®*)
* This product contains more than one active constituent
List of chemical families, approved active constituents and, in parenthesis, the trade name of the first registered product or successor. Refer to the APVMA website (www.apvma.gov.au) to obtain a complete list of registered products from the PUBCRIS database.
Content last updated: June 28, 2019