Improving Integrated Weed Management (IWM) practice in the northern region
The key issues addressed by this proposed project are the sustainable management of hard-to-control weeds in fallows and preserving the effective life of glyphosate. More specifically, it will involve strategic research on developing and improving chemical and non-chemical tactics, weed ecology, and herbicide application for problem and emerging weeds of summer fallows in the main cropping regions of the Northern Region.
This proposed project will further develop and build on the outcomes and outputs from three finishing Grains Research & Development Corporation (GRDC) funded projects. It will complement the new proposed project 'Improved IWM systems in transgenic farming landscapes' submitted to Cotton Research & Development Corporation (CRDC). This project team will collaborate with Australian Herbicide Resistance Initiative, the GRDC 'Understanding and management of resistance to Group M, L and I herbicides - national project', Australian Glyphosate Sustainable Working Group, Grower Solutions Groups and the chemical industry to ensure the best technology is tested, validated, extended and available to growers.
This new knowledge will be integrated, along with other appropriate knowledge from finishing projects and collaborative projects, into Best Management Practices (BMP) for barnyard grass, liverseed grass, feather-top Rhodes grass, windmill grass, fleabane, sowthistle, glyphosate resistance, improved spray quality and other emerging problem or resistant weed issues.
As the result of this project, growers and advisors of the Northern Region will be aware of new advances in improved IWM practices for difficult-to-control and emerging weeds. Consequently, they will be in a much better position to control their problem weeds and avoid glyphosate resistance.
To achieve this, the project will generate improved knowledge on ecology and seed-bank dynamics of hard-to-control weeds and weeds at risk for developing glyphosate resistance (feather-top Rhodes grass, windmill grass, barnyard grass, liverseed grass); information essential for developing best management practices for these problem weeds. New non-chemical options to drive seed-banks down will be tested and quantified for the key weeds. This project will generate improved knowledge on safe and effective use of new chemistries as well as new uses for currently available glyphosate alternatives that are appropriate for controlling key weeds in Northern Region environments, particularly for the summer grasses. Spray application of these products will be improved and patch management of problem weeds using weed detector technology will help ensure highly efficacious fallow control for the key weeds. The economic benefits of the new improved tactics will be evaluated. The team will develop collaborative links with national and international researchers on chemical and non-chemical tactics, weed ecology and spray application, to ensure the best new technology is tested for the Northern Region.
The team will package this new knowledge on weed ecology, economics and improved control tactics into BMP for key weeds, particularly for glyphosate susceptible and glyphosate resistant populations, including barnyard grass, liverseed grass, feather-top Rhodes grass, windmill grass, sowthistle, and fleabane, plus any new emerging glyphosate resistance weed. These BMP with improved IWM practices will be applicable for the farming systems in central and southern Queensland and northern NSW, with emphasis on summer fallows in Northern Region grains cropping systems.
Understanding and management of resistance to Group M, L and I herbicides - national project
Herbicide resistance is a major risk to crop production in Australia. No-till cropping is highly reliant on herbicides for weed control. The loss of herbicides to resistance will increase costs to growers, increase the difficulty of management and threaten the sustainability of farms. This project will seek to prolong the life of glyphosate, paraquat and Group I herbicides through better understanding of the problem, better decision making and demonstration of strategies in a whole farm situation. Discussions will be held with other users of these herbicides where resistance may impact on the grains industry to develop better practices and reduce the risk to grain growers.
This project will develop better understanding of resistance to glyphosate, paraquat and Group I herbicides to better inform weed management. The project will develop a range of tools for farm advisors to improve their confidence in decision making with respect to reducing the risk of glyphosate, Group I and paraquat resistance. These will include risk assessments, case studies and scenario exploring tools. The project will investigate the potential for alternatives to these herbicides, concentrating on knockdown uses and Group I herbicides for Brassica weeds, which may prove useful in Australian agriculture and discuss with commercial providers the potential for registrations. The project will establish farm advisor learning groups to work on the application of the research in local areas where resistance is already a major problem and to improve adoption of research from this and other projects.
The outcomes of the project will be primarily aimed at farm advisors, but will also be of benefit to grain growers and others in the industry.
Alternative chemical options for control of flupropanate resistant serrated tussock
Serrated tussock (Nassella trichotoma) is a Weed of National Significance causing major agricultural and environmental impacts in Australia. Herbicides registered for control of serrated tussock in pastures are flupropanate, glyphosate and 2, 2-DPA. Flupropanate is widely regarded as the most selective and effective herbicide for serrated tussock control, however serrated tussock has become resistant to flupropanate in some areas.
Flupropanate-resistant serrated tussock was first identified on a Victorian property in 2002 and has since been confirmed in several locations from Armidale to Goulburn in New South Wales and Diggers Rest and the Rowsley Valley in Victoria. There are few other effective options; glyphosate is the next option which is non-selective and results in far too much off-target damage of native grasses.
Herbicide resistance is the ability of a plant to survive and reproduce following exposure to a dose of herbicide that would normally be lethal. In a plant, resistance usually occurs through natural selection resulting from random and infrequent genetic mutations. Susceptible plants are killed while herbicide-resistant plants survive to reproduce. If the herbicide treatment is repeated the resistant plants can successfully reproduce and become dominant in the population. The appearance of herbicide resistance in a plant population is an example of rapid weed evolution and typically develops when a weed species has been exposed to 10-14 years’ of continued application of a particular herbicide group or type. Large weed populations increase the likelihood of resistance developing.
The main objective of this project is to investigate other mode-of-action herbicides that may have a commercially acceptable use. With the data/evidence gathered from a series of research trials, application for a Pesticide Permit from the APVMA will allow NSW farmers added herbicide options to better combat or delay herbicide resistance.
For more information on any of the above projects contact Tony Cook, Technical Specialist Weeds on (02) 6763 1250 or email firstname.lastname@example.org