What’s the impact of IMI residues on TT canola?
May 15, 2024What 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.
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.
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.
Technical Development contact details: Justin Kudnig 0408 408 616 or justin.kudnig@advantaseeds.com.au