Related Articles


Why chaff decks are a great option for harvest weed seed control

WeedSmart Southern Extension Agronomist, Greg Condon, who is a big advocate of chaff decks, joins us to give us some answers!
We also hear from Northern Region grower, Chris Berry. He has had a chaff deck for a number of years and while he likes the concept of the mill, is sticking with the chaff deck for now.
Effects on paddock from using a chaff deck. Photos supplied by podcast guest, Chris Berry.
Regional Update
Our next Regional Update will come out next Monday and we’ll be hearing from Norther Region expert, Tim Bartimote. Tim is a Senior Land Services Officer in the Cropping division for NSW Central West Local Land Services.
Over the last two years, Tim has been working on a chaff decking paddock demonstration project which has GRDC investment.
New Content
We’ve got great content on the WeedSmart website for you to check!
Make sure you check out our latest Ask an Expert. It looks at how you can maximise grass weed control using hybrid canola. EPAG Research agronomist, Andrew Ware provides the answers. Read it here.
Also, don’t miss our latest Case Study on the Single family, based in Coonamble, NSW.
We also hosted a webinar last week with WeedSmart Southern Extension Agronomist Chris Davey & ICAN’s Mark Congreve. They looked at considerations for pre-emergent herbicides with dry sowing.
You can watch it here.


Considerations for pre-emergent herbicides with dry sowing

In this webinar, we focus on what factors influence the residual control of weeds by pre-emergent herbicides with a focus on Trifluralin, Sakura and new-to-market herbicides.
Chris Davey, YPAG and WeedSmart Extension Agronomist and Mark Congreve, ICAN Senior Agronomist, assessed the sowing issues in South Australia and discussed strategies on using pre-emergents.
Factors covered include:

Soil type/texture
Rainfall forecast (after application)
Characteristics of the herbicide
Characteristics of the crop
Sowing time (tine vs disc) – sowing depth, speed, soil throw, stubble
Resistance status

GRDC Spray Application Manual
This Spray Application GrowNotes™ manual provides information on how various spraying systems and components work, along with those factors that the operator should consider to ensure the sprayer is operating to its full potential.
This manual focuses on issues that will assist in maintaining the accuracy of the sprayer output while improving the efficiency and safety of spraying operations. It contains many useful tips for your spray operations.


Innovative northern grower shares wins and Roundup Ready Xtend stewardship

Bruce is primarily a winter crop grower but also has a block of sorghum on 50cm rows (pictured above) sown into a cover crop of barley & lentils.
Farmer Bruce Watson and daughter
We also learn about Bayer’s Roundup Ready Xtend Crop System. This is Bayer’s new cotton weed control system. Bayer Marketing Lead for seeds, traits & round-up Donny Benn & Bayer Market Advancement Manager Matt Hayes joins us to tell us more about the stewardship around this approach.
Roundup Ready® Xtend Crop System Field Day (Feb 10, 2021) at Locharba, Bayer’s research farm.
Locharba Roundup Ready® Xtend Crop System trial (Bayer supplied).
Xtend workshops
Register here.
New WeedSmart Content
Mix up your approach to fence line weeds – read more here.
Producer: Jessica Strauss
Presenters: Jessica Strauss & Peter Newman


Farmer questions answered on Group G herbicides and optimum application temperature

In this follow-up to last year’s webinar on Group Gs, Dr Chris Preston, University of Adelaide, Professor of Weed Management and WeedSmart’s Greg Condon focus on farmer questions around Group G herbicide use.
They explain the new Group G chemistry in simple terms and address questions around what temperature range provides optimum herbicide efficacy.


How do I make the right decision on using Group Gs?

Choosing and applying the right pre-emergent herbicide can be difficult, particularly if herbicide resistance is becoming a challenge in a no-till system. Join Dr Chris Preston, University of Adelaide (UA) professor weed management and WeedSmart’s Chris Davey as they explain the new Group G chemistry and de-mystifies which Group G works best for winter cropping systems.


The unsung hero – crop competition

We don’t want to give the weeds a free kick by growing un-competitive crops. Crop competition with weeds is a double-edged sword. There is the effect of the weeds on the crop, and the effect of the crop on the weeds. A competitive crop will suffer less yield loss at the hands of the weeds, and will also reduce seed set of the weeds compared to an un-competitive crop. In other words more crop, fewer weeds.
In this week’s podcast, AHRI Extension Agronomist Greg Condon and AgriVision Agronomy Consultant Matt Bissett (pictured) provide excellent overviews on the different crop competition approaches that can be employed.
There are six main aspects of crop competition:
1. Seed rate
2. Row spacing
3. Orientation (north-south vs. east-west)
4. Crop variety/species
5. Soil health
6. Time of sowing – early sowing is usually best
It’s hard to get all of the six points above right, and growers need not aspire to practising all six of these competition factors, but they can use a range of these practices to ensure that their crops have a fighting chance against the weeds.
Crop Competition is one of the Big 6, which you can learn all about here, but first, let your regular hosts Jessica Strauss and Peter Newman take you on the crop comp journey in the podcast below!


Testing all of your herbicides for resistance with Roberto Busi

Dr Roberto Busi
Roberto discusses what the current levels of resistance to knock-down herbicides (glyphosate and paraquat) are, resistance to new and old pre-emergent herbicides and resistance to clethodim.
The results are discussed with Peter Newman by analysing the pros and cons of herbicide resistance testing and the value of herbicide efficacy and resistance testing with new herbicides coming into the Australian market from 2021.


Glyphosate Resistance Update with Peter Boutsalis

Dr Peter Boutsalis from the University of Adelaide joins this webinar to discuss tips to optimise the efficacy of glyphosate and when and when not to use the double knock strategy.
Peter also shares the latest results from the GRDC-funded random weeds survey in the Eyre Peninsula and southern Victoria and how the resistance levels in these areas have changed over the last 5 years.


You don’t know what you don’t know about managing weeds

Agronomists play a key role in the northern region, not only in identifying and tackling crop weeds but also in protecting chemistries. In the face of this challenge, utilising the WeedSmart Big 6 tools is showing results in tackling problem weeds.
Join Crop Consultants Australia’s Director Ben Dawson, as he hosts Dr. Chris Preston and Paul McIntosh from WeedSmart and they discuss the role that agronomists can play in breaking this cycle.


New chemistry – what’s new, what’s coming & how to keep them for longer

There is a range of new pre and post-emergent herbicides coming to the market in the coming seasons which will broaden weed control options and use patterns.
As new chemistry becomes available it is crucial for all involved to protect the longevity of any new products and minimise the risk of resistance.
In this webinar, WeedSmart’s Southern Extension Agronomist Greg Condon will explore the opportunities these new herbicides provide growers and how we can protect these herbicides using the WeedSmart Big 6.


Know thy enemy – biology of our most problematic crop weeds with Dr Catherine Borger

These weeds cost growers $22.5 and $1.7 million per year, respectively. Understanding the ecology of these species is vital to developing a successful weed management plan.
A five-year GRDC project produced results on emergence patterns, seed bank persistence, seed shedding and competitive ability of great brome and barley grass, in Western Australia and South Australia (‘Seed bank ecology of emerging weeds’ UA00156).
The project found that three to four years seed set control was needed to remove a great brome or barley grass soil seed bank.
Great brome had high seed production in Western Australia and South Australia. Barley grass had much higher seed production in South Australia than Western Australia. Great brome grass and barley grass reduced crop yield, and in 2019, great brome at low to high densities reduced economic returns from a Mace wheat crop at Wongan Hills by $90-205/ha. Barley grass reduced economic returns of wheat by $67-138/ha.
Data on weed ecology and competitive ability was used to update a decision support tool; the Weed Seed Wizard (WSW).
The updated model was used to investigate harvest weed seed control (HWSC) as a potential management technique for great brome grass and barley grass.
The modelling indicated that harvest weed seed control is a valuable tool in the management of these species, even in the years where most weed seed is shed prior to harvest.
You can read Catherine’s paper here: Great brome and barley grass – modelling the long-term value of harvest weed seed control


WeedSmart in HRZ – practical options for dealing with ryegrass

Effective ryegrass control is becoming increasingly difficult in High Rainfall Zone farming
This webinar is designed to help growers and agronomists explore farming system-
based options to manage annual ryegrass populations in our cropping areas.
Grassroots Agronomy’s Greg Condon is a leading agronomist from Southern NSW, involved with the GRDC’s National WeedSmart project, which focuses on ‘the farmer calling the shots, not the weeds’. Greg will present options, (not just chemical) which HRZ growers could integrate into their farming systems to help manage difficult-to-control weeds.
This webinar is brought to you by Southern Farming Systems and the Grains Research Development Corporation and presented by WeedSmart.

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