Weed webinars

Advances in weed management webinars

Below are links to GRDC supported webinars on weed management. These webinars were recorded and links to the recordings and pdf's of PowerPoint presentations are available from the links below. Click on the title to go to the page for the webinar.

Ecology and management of wild oats

Wild oats has been a consistent and ongoing problem weed in winter cropping in the northern region for many years. Growers who are focused on elimination of seed returning to the soil have been able to drive down the seedbank over time, resulting in low numbers in many paddocks. However widespread resistance to a range of post-emergent herbicides is now making control difficult in many paddocks. 

This webinar continues to build on the library of previous webinars focusing on key problem weeds. It addresses the ecology of wild oats, the latest on herbicide resistance and discuss how we can use this information to develop effective management strategies.

Webinar held June 2016

Maximising glyphosate: performance of different salts and adjuvants

Despite concerning levels of weed resistance, glyphosate is likely to remain the most widely used herbicide in broadacre grains cropping for many years to come.

During this webinar we are joined by Andrew Somervaille who has been conducting field trials with glyphosate since its introduction in Australia. Andrew explains the different glyphosate salts and how they enter the leaf; behaviour in the spray tank and which adjuvant system is preferred for each formulation.

Webinar held June 2016

Ecology and management of feathertop Rhodes grass

Feathertop Rhodes grass has emerged as a major weed of zero till cropping in the northern region. It is well adapted to current farming practices and when this is coupled with tolerance to glyphosate it can rapidly become a major problem in some fields.

This webinar continues to build on the library of previous webinars focusing on key problem weeds. It addresses the ecology of feathertop Rhodes grass and discusses how we can use this information to develop effective management strategies.

Webinar held February 2016

Managing sorghum injury when using metolachlor herbicides

Grass weeds are rapidly adapting to zero till farming systems and are a major challenge to growing sorghum, especially as there are no effective in-crop herbicide options for selective grass weed control.

Metolachlor based herbicides (e.g. Dual Gold®) are frequently the main pillar of pre-emergent weed control strategies targeted at grass weeds in sorghum. Under certain circumstances, crop injury can occur despite the use of a herbicide safener on the sorghum seed. This webinar discusses the factors that influence crop injury, best use of Concep® II safener and how growers and agronomists can best manage risk.  

Webinar held February 2016

Ecology and managment of common sowthistle

Once thought of as a winter weed, common sowthistle is now causing problems all year round in the northern grains region, particularly in summer fallows. The conformation of glyphosate resistant populations in 2014 has significantly raised the importance of this problem weed.

This webinar continues to build on the library of previous webinars focusing on key problem weeds. It addresses the ecology of sowthistle, provide an update of the latest on herbicide resistance and discuss how we can use this information to develop effective management strategies.

Webinar held December 2015

Maximising the performance of paraquat based herbicides in northern fallow

With the continual rise of glyphosate resistance, growers are increasingly relying on fallow weed control strategies incorporating the use of bipyridal (Group L) herbicides. In this webinar we will be focusing on what Group L herbicide strategies are working and how to achieve the maximum performance from these contact herbicides. The webinar will also discuss topical issues such as night versus day application, double knock strategies, tank mixing and, of course, the safe use of paraquat.   - See more at: http://grdc.com.au/Resources/IWMhub/Weed-Webinars/Maximising-the-performance-of-paraquat-based-herbicides-in-northern-fallow#sthash.qNWWKJOL.dpuf

With the continual rise of glyphosate resistance, growers are increasingly relying on fallow weed control strategies incorporating the use of bipyridal (Group L) herbicides. In this webinar we will be focusing on what Group L herbicide strategies are working and how to achieve the maximum performance from these contact herbicides. The webinar will also discuss topical issues such as night versus day application, double knock strategies, tank mixing and, of course, the safe use of paraquat.

Webinar held December 2015

Grass weed control with Group A herbicides

With evolving herbicide resistance, growers need to develop alternative control measures. One tactic which has been demonstrated to be effective in controlling selected grass weeds is the use of Group A herbicides, either in fallow or within summer broadleaf crops. The Grass weed control with Group A herbicides webinar will highlight situations where Group A herbicides have shown to be an effective integrated weed management tactic, how to maximise performance in the field, and considerations to delay resistance to this mode of action.

Webinar held December 2014

Latest research on managing barnyard grass

Barnyard grass is a prolific weed of fallow and summer crops, with multiple germinations occurring each spring and summer. Over recent seasons many glyphosate resistant populations have been identified, making control in fallow especially difficult. The Latest research on managing barnyard grass webinar will highlight the ecology of barnyard grass and how to use this information to assist in managing it; herbicide resistance status; and weed control tactics that are being successfully employed to manage this weed.

Webinar held December 2014

Weed control on paddock boundaries and fencelines

Weeds often invade from the perimeters of paddocks, so an important integrated tactic in weed management is to keep paddock boundaries free of invading species. The Weed control on paddock boundaries and fencelines webinar addresses strategies for managing paddock boundaries and fence lines to reduce the impact of weeds. Sub topics include: how weeds move into a paddock and how they adapt to the farming systems within the paddock.

Webinar held June 2014

Managing wild radish, the latest research

Wild radish (Raphanus raphanistrum) is a prolific weed of winter cropping in southern states and in particular Western Australia, however is becoming an increasing significant problem in the eastern states. Wild radish has developed resistance to many modes of action and the recent discoveries of glyphosate resistant in the west and phenoxy resistant individuals in NSW has raised further the level of concern. The Managing wild radish, the latest research webinar highlights the ecology of wild radish and how to use this information to assist in managing it; herbicide resistance status; and weed control tactics that have been successfully employed to manage this weed.

Webinar held June 2014

A beginner's guide to harvest weed seed control

You have probably read the press releases of the non-herbicide weed control strategies that are being employed over large areas in the west at harvest time to reduce the weed seed burden and to manage resistant weeds. The Beginner's guide to harvest weed seed control webinar is designed to provide some helpful tips for advisers and growers who wish to explore this option however may be unsure where to start. Topics that will be explored include why to consider harvest weed seed control; what options are available; what paddocks to target; and how to achieve success.

Webinar held June 2014

Managing fleabane in zero till farming systems

Flaxleaf fleabane (Conzya Bonariensis) has been a prolific weed of zero till farming systems in the northern region for over 10 years and can now be found in zero till farming systems in all mainland states. The Managing fleabane in zero till farming systems webinar highlights the ecology of fleabane and why this is driving the spread of fleabane across the nation, glyphosate resistance status and weed control tactics that have been successfully employed in the northern region to manage this weed.

Webinar held November 2013

Spray application in summer fallows

Changing weed species, changing climate patterns and the requirement for double knock applications using contact herbicides to control difficult weeds are seeing an increase in summer fallow herbicide applications in most broadacre zero till farming systems. The Spray application in summer fallows webinar investigates the balance between minimising spray drift and ensuring reliable efficacy via efficient spray deposition on the target when making spray applications during the warmer summer months. The important considerations of water rates, nozzle selection, boom height and ground speed will be discussed and how to effectively manage these under rapidly changing daily environmental conditions that typically occur during the summer months.

Webinar held December 2013.

Understanding stubble & soil binding of pre-emergent herbicides for annual ryegrass control in winter crops

Pre-emergent herbicides are one of the key management tactics for managing annual ryegrass in winter crop production systems in Australia. Efficient utilization of these tools requires an effective understanding of how these herbicides interact with soil and stubble and, following on from this, their requirements for incorporation. The Understanding stubble & soil binding of pre-emergent herbicides for annual ryegrass control in winter crops webinar investigates the properties of key pre-emergent herbicides pyroxasulfone (Sakura®), prosulfocarb/s-metolachlor (Boxer® Gold), dimethenamid-P (Outlook®) and trifluralin (Treflan®) and how the herbicide properties affect stubble binding and soil mobility.

Webinar held December 2013