Herbicide behaviour

Herbicides are an essential tool enabling cost-effective management of weeds as part of an integrated strategy. Herbicides represent a major input cost for grain growers.

Hence, understanding how herbicides work and the factors which impact their usefulness is critical to maximise the effectiveness of these valuable tools.

Although widely used, herbicides are complex and optimising their effectiveness can be challenging. Maximising herbicide performance becomes especially critical as herbicide resistance increases.

Understanding the science behind how herbicides work in different environments also helps enable forensic evaluation of the causes of spray failures when they occur.

To assist growers and advisers with their decision-making, the Grains Research and Development Corporation has developed, and will continue to produce, resources focused on optimising herbicide use through fostering a greater understanding of their behaviour.

Reference manuals and factsheets

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Rotational crop constraints for herbicides used in Australian farming systems

04 Jul 2019 Publication

This guide has been developed to provide grain growers and advisers with relevant information to assist in planning the use of herbicides into crop sequences and in managing rotation constraints.

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Soil behaviour of pre-emergent herbicides in Australian farming systems: a reference manual for agronomic advisers

06 Nov 2023 Publication ICN1811-001SAX, ICN2307-001SAX

When devising a weed control strategy, pre-emergent herbicides can be a valuable additional tactic to help drive weed numbers down. Used alone they often do not achieve the objective of driving down weed seed bank…

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Understanding post-emergent herbicide weed control in Australian farming systems

06 Nov 2023 Publication ICN1811-001SAX, ICN2307-001SAX

Understanding post-emergent herbicide weed control in Australian farming systems – a national reference manual for agronomic advisers.

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Adjuvants Booklet

01 Sep 2019 Publication ICN1905-002WSX

The 2014 adjuvants booklet provides a practical guide to the use of adjuvants in a variety of farm chemicals including herbicides, fungicides, insecticides and growth regulator products.

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Mixing knockdown partners with Group G herbicides

17 Jun 2019 Factsheet ICN1811-001STX

This fact sheet discusses some of the considerations in selecting the choice of tank mix partner for Group G herbicides in fallow.

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Rotational constraints for pulse crops following the use of aminopyralid, clopyralid and picloram herbicides

18 Jun 2019 Factsheet ICN1811-001STX

Herbicides from the Group I Mode of Action are effective knockdown herbicides against many broadleaf weeds. Use this publication to learn more about rotational constraints for pulse crops.

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Optimising Group A herbicides in canola

01 Aug 2019 Factsheet

In the absence of herbicide resistance, these herbicides quickly and effectively shut down growth of small grass weeds. This removes competition within days of application, despite often taking a number of weeks for herbicide symptoms…

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Keeping sorghum safe

07 Apr 2016 Factsheet ICN1307-001RTX

Keeping sorghum safe when using metolachlor-based herbicides. To reduce seedling injuries, applying Concep® II seed safener is an essential step for growers.

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Pre-harvest Herbicide Use fact sheet

23 Aug 2022 Factsheet

Stewardship for pre-harvest application of herbicides in winter crops:
The responsibility to avoid herbicide residues in delivered cereal, pulse and oilseed grains sits squarely with grain growers and their advisers.
The application of herbicides late in the…

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Pre-emergent herbicides fact sheet

11 Apr 2022 Factsheet ICN1811-001SAX

With the continued evolution of herbicide resistance, growers are being forced to introduce a range of different weed control tactics.

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