What's the impact of IMI residues on TT canola?
May 15, 2024
What's the impact of IMI residues on TT canola?
May 15, 2024

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What's the impact of IMI residues on TT canola?
Using Hyola CT instead of TT canola when IMI residues are present, results in better gross margins.
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Hyola™ CT crop protection benefits chart with green field rows and blue text panels

What did we learn?

  • Using Hyola CT instead of TT canola when IMI residues are present, results in better gross margins.
  • The effect of IMI residues is greater in soils where herbicides were more mobile due to acid soils and
    higher rainfall after sowing.



In 2020, data from three sites in WA, NSW and VIC were analysed to understand the benefit of using Hyola canola with Clearfield® and triazine tolerant (CT) traits compared to triazine tolerant (TT) canola, when imidazolinones (IMIs) residues were present. The five treatments (figure 2) were all applied four months before sowing.


What was the establishment like?

Figure 1: plant establishment was significantly better using Hyola CT rather than TT when IMI residues were present.

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Across the three trials, the TT plots had less plants establish and they were less developed than the Hyola CT. The extent of effect of the IMI residue varied between sites, with Wallendbeen the least affected and Horsham, the most affected. In general, the OnDuty and Spinnaker treatments had the poorest establishment in these trials.

What about the gross returns?

Figure 2: while all the IMI treatments resulted in TT canola gross return losses, the OnDuty and Spinnaker residues caused the greatest TT losses.

Blue table comparing ICT treatment results and EEA criteria across four groups.

The degree of gross return losses for TT compared to CT varied between sites and treatments, with Horsham having the greatest losses and Wallendbeen the least. The effects of the IMI residue was greater in soil types where the herbicides were more mobile due to acid soils and higher rainfall after sowing.



To access the technical document, download the research.


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2020 Hyola® CT IMI Residue Trial – Agronomic Details 

Blue-and-white table titled “2020 Pacific Seeds Hyviä CTM Residual Trial - Overall Details” with trial data rows.
Blue header table showing 2020 Pacific seed physio CTF mean rainfall totals by soil depth and soil type.
Blue spreadsheet titled “2023 Pac E… Residual Trials - Sewing Details” with rows and columns of data

2020 Hyola® CT IMI Residue Trials - Rainfall Distribution Details 

2020 Wallendbeen NSW - Hyola CT IMI Residue Trial Monthly Rainfall 

Blue bar chart of 2020 Wallenbeen NSW monthly rainfall, with values labeled Jan–Oct.

2020 Morbinning WA - Hyola CT IMI Residue Trial Monthly Rainfall

Bar chart of 2020 Morbinning WA rainfall by month, with peaks in June and February.

2020 Hyola® CT IMI Residue Trials - Rainfall Distribution Details 

2020 Wallendbeen NSW - Hyola CT IMI Residue Trial Monthly Rainfall 

Bar chart of monthly rainfall at Hyoja CTI residue trial, with blue bars from Jan to Oct and values labeled.
Rows of green crops growing in a brown field under a clear sky

2020 Hyola® CT IMI Residue Trials – Herbicide Treatment Listing 

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GROUP B – IMI IMIZAPIC CHEMISTRY GENERAL PROPERTIES – ALS INHIBITORS 

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Source: 2019 GRDC PUBLICATION - SOIL BEHAVIOUR OF

PRE-EMERGENT HERBICIDES IN AUSTRALIAN FARMING SYSTEMS

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GROUP B – IMI IMIZAPYR CHEMISTRY GENERAL PROPERTIES – ALS INHIBITORS 

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Source: 2019 GRDC PUBLICATION - SOIL BEHAVIOUR OF PRE-EMERGENT HERBICIDES IN AUSTRALIAN FARMING SYSTEMS

Small green and yellow seedling growing in dry, cracked soil with twigs around it

GROUP B – IMI IMIZAPYR CHEMISTRY GENERAL PROPERTIES – ALS INHIBITORS 

Sulfurylureas medication comparison chart with green table and safety notes on the right

Source: 2019 GRDC PUBLICATION - SOIL BEHAVIOUR OF PRE-EMERGENT HERBICIDES IN AUSTRALIAN FARMING SYSTEMS

Young green plants growing in rows in dry soil, viewed from above
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Blue presentation slide with crop rows and text: “2020 Hoya CT IMI Residual Trials Analysed Grain Yield Results”

2020 Wallendbeen NSW – Hyola® CT IMI Residual Trial - Analysed Grain Yield Results 

2020 Wallendbeen NSW Hyola CT vs TT IMI Residue Trial Yield Results (t/ha)

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2020 Horsham Vic – Hyola® CT IMI Residual Trial - Analysed Grain Yield Results 

2020 Horsham Vic - Hyola CT vs TT IMI Residue Trial Yield Results (t/ha)

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2020 Morbinning WA – Hyola® CT IMI Residual Trial - Analysed Grain Yield Results 

2020 Morbinning WA - Hyola CT vs TT IMI Residue Trial Yield Results (t/ha)

Blue bar chart with multiple labeled categories and error bars, showing values compared across groups.

2020 Hyola® CT IMI Residue Trials – OP TT % Range of Grain Yield vs 100% TT Control 

2020 TT Technology IMI & SU Carryover Treatment - % Grain Yield Comparisons Range vs 100% TT Control across 3 Trial locations 

Blue and dark-gray bar chart comparing two metrics across multiple categories
Aerial view of bright yellow canola fields with trial plots and text overlay about 2020 canola trial results.

2020 Wallendbeen NSW – Hyola® CT IMI Residual Trial Gross Return $/ha Results 

2020 Wallendbeen NSW - Hyola CT IMI Residue Trial Gross Returns $/ha

Blue and dark-blue bar chart comparing multiple categories with values labeled above each bar.

2020 Horsham Vic – Hyola® CT IMI Residual Trial Gross Return $/ha Results 

2020 Horsham Vic - Hyola CT IMI Residue Trial Gross Returns $/ha

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2020 Morbinning WA – Hyola® CT IMI Residual Trial Gross Return $/ha Results 

2020 Morbinning WA - Hyola CT IMI Residue Trial Gross Returns $/ha

Bar chart with dark and light blue bars comparing values across categories, with labels along the x-axis.
2020 Hydr™ CT IMI residue trials data results; aerial view of colorful crop test plots

2020 Wallendbeen NSW – Hyola® CT IMI Residual Trial Overall Results Table 

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Spreadsheet-style table with a yellow header and multiple rows of text and red numbers across columns

2020 Morbinning WA – Hyola® CT IMI Residual Trial Overall Results Table 

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2020 Horsham Vic – Hyola® CT IMI Residual Trial Overall Results Table 

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2020 Summer Applications (3 Trials) vs 2019 PSPE Applications (5 Trials)

Triazine Technology IMI & SU Treatment Comparisons 

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The information provided in this publication is intended as a guide only. Advanta Seeds Pty Ltd (including its officers, employees, contractors and agents) (‘Advanta Seeds’) can not guarantee that every statement is without flaw of any kind. While Advanta Seeds has taken all due care to ensure that the information provided is accurate at the time of publication, various factors, including planting times and environmental conditions may alter the characteristics and performance from plants. Advanta Seeds shall not be liable for any errors or omissions in the information or for any loss, injury, damage or other consequence whatsoever that you or any person might incur as a result of your use of or reliance upon the products (whether Advanta Seeds products or otherwise) and information which appear in this publication. To the maximum extent permitted by law, the liability of Advanta Seeds for any claim whatsoever arising out of the supply or use of or reliance upon the products and information in this publication (including liability for breach of any condition or warranty implied by the Trade Practices Act 1974 or any other law) is limited at its discretion, to the replacement of the products, the supply of equivalent products or the resupply of the publication. For application to specific conditions, seek further advice from a local professional. © Advanta Seeds 2021.