Improved weed control in coastal NSW grain production

Improved weed control in coastal NSW grain production

The northern NSW coastal grain production region has been identified as an area where increased grain production is a targeted objective. This region is characterised as a high rainfall farming system, typically beef cattle + grain, or sugarcane + grain cropping.

As growers’ transition into increased grain production, any negative experiences due to wrong agronomic decision making is likely to have significant and lasting consequences on further adoption of a grains rich farming system.

Weeds are a major constraint to productivity in this area and failure to employ the latest knowledge and technology can have significant impacts across the entire farming system. Issues such as herbicide resistance and crop injury due to herbicide carryover have been highlighted as issues impacting grain production, while other concerns related to identification of emerging weeds, best practice spray application and drift management are also important to growers.

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GRDC has identified the need for enhanced extension in weed management in this region. ICAN will lead a 30 month project to assist local growers in upskilling their weed management knowledge and decision making via a diverse range of extension pathways.

⇩ Workshops & seminars ⇩ Herbicide resistance testing ⇩ Extension resources

Coastal weeds workshops and seminars

Over the course of the project, ICAN will be hosting a series of 1-day workshops and extension seminars designed to provide grain growers with the latest information on weed management and control tactics.

July 2022 pre-emergent herbicides in coastal grain system workshops

Pre-emergent herbicides are an important tool in managing weeds in the coastal weeds system. To achieve robust weed control, it is very important to understand how each herbicide interacts with the soil, stubble and trash load and the environment, while also ensuring correct herbicide and crop seed separation to achieve the adequate crop safety required for establishment.

These ¾-day GRDC supported workshops will be targeted to Coastal NNSW crops and will be delivered by ICAN. The workshops will be targeted to growers and their advisers and look to explore the key factors that drive performance of pre-emergent herbicides.

Areas of focus will be

  • Getting herbicide to the soil – encompassing application, stubble and trash management and reducing environmental losses (e.g. leaching)
  • How soil type; soil moisture and seeding system influence herbicide mobility; crop safety and product performance
  • Where are the weed seeds in the soil profile, and why is this important?
  • Where should we use IBS, PSPE or EPE application timing?
  • Managing residual carry-over from applications in previous seasons
  • How do we optimise the key pre-emergent herbicides? And where do each best fit in the farming system?

Participants will leave with a better understanding of the key factors dictating herbicide performance and what can be done in the paddock to ensure weed control is maximised.

2022 workshop locations

  • Harwood - Tuesday 19 July 2022, Harwood Community Hall, River St, Harwood Island
  • Ballina - Wednesday 20 July 2022, Ballina RSL, 1 Grant St, Ballina
  • Casino - Thursday 21 July 2022, Casino RSM, 162 Canterbury St, Casino
  • Murwillumbah - Friday 22 July 2022, Murwillumbah Services Club, 10 Wollumbin St, Murwillumbah

Click on the button below to register for one of the workshops.

<< 2022 Coastal weeds pre-emergent herbicide workshop registration

For further information contact Mark Congreve, 0427 209 234 or Erica McKay, 0417 063 036

These workshops are part of the GRDC investment “Expanding grain production in Coastal NSW through improved weed management”. The workshops are free of charge however participant numbers will be limited. Registrations will be accepted on a first come basis.

Webinar on coastal weeds

In May 2022, a webinar was run for coastal growers and advisers on coastal weed management. A recording of the webinar is available below.

2021 Coastal Post-Emergent Herbicide workshop

In 2021 a series of 1-day workshops on post emergent herbicides were held. Notes available below

GRDC coastal weeds workshop notes, November 2021 (post emergent herbicides)

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Herbicide resistance testing for grain crops in northern coastal NSW

Grain growers on the north coast of NSW have the opportunity to have key priority weeds screened for potential herbicide resistance as part of a new GRDC weeds project. Participation in this program helps generate an industry view of the types and level of herbicide resistance present in the coastal NSW farming system, while also providing individual growers with a report on herbicide resistance for their paddock/weed of concern.

Available resources for resistance testing are limited, so interested growers are invited to register their interest by completing the form by clicking on the pdf link below.

CSU Resistance testing form

The Charles Stuart University herbicide resistance testing team plan to undertake a field trip in late summer to collect the bulk of weed seed samples. This will be coordinated just prior to summer crop harvest, when weed seeds are mature.

Growers / agronomists who want to have a field included in the survey can chose to either have the CSU team undertake sample collection; or collect their own seed should their harvest time not align with the CSU district collection.

If collecting your own seed:

  1. Collect at least 1 cup full of clean weed seed (more for species with large seeds or pods) either from screenings on your header or from plants randomly throughout the paddock. An A4 envelope full of seed heads will also be sufficient. Insufficient seed will reduce the number of herbicides that can be tested. Only include weed seeds from a single paddock as results may vary. Only 1 weed species per envelope. NOTE: More seed collected the better.
  2. Place each sample in a sealed paper bag. Print out and complete all sections of the form on this page and place the seed sample and identification form in an envelope.
  3. Mail samples as soon as possible to avoid seed deterioration.
  4. Address to Herbicide Resistance Testing, School of Agricultural and Wine Sciences, Charles Sturt University, Locked Bag 588, Wagga Wagga, NSW, 2678.

For further information contact: John Broster Phone: 02 6933 4001 Mobile: 0457 272 075 Email:

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Extension resources

Over the course of this project, this page will be updated with weed management resources applicable to coastal grains production.