GROWERS will be able to legally desiccate canola with glyphosate, after the Australian Pesticides and Veterinary Medicines Authority (APVMA) approved a product for pre-harvest use.
Nufarm's Weedmaster glyphosate formulation has been registered for use either after 20 per cent seed colour change or under the cutter-bar at windrowing.
The registration gives farmers a means to control late season weeds, especially broadleaf weeds which often remain green during harvest and can impact on the sample, but the big impact is on late germinating problem weeds such as ryegrass.
A late season application of glyphosate will reduce seed set from late germinating ryegrass and lower the weed burden in the following year's crop.
The APVMA decision follows a three-year joint project between Nufarm and the Grains Research and Development Corporation (GRDC).
Andrew Wells, research and development manager for Nufarm, said the new registration was gave growers flexibility.
"There are currently very few registered options for growers to control annual weeds prior to harvest and this registration will give growers more options to help reduce the weed seed set and the potential for herbicide resistance developing," Mr Wells said.
He said trial results, as part of the registration process, showed that an application of Weedmaster DST on canola at windrowing reduced annual ryegrass seed production by more than 70 per cent, with similar results seen when applied to standing crops prior to harvest.
"The issue of weed seed set is particularly important when considering weeds like annual ryegrass and wild radish, which are both capable of producing thousands of weed seeds per plant and can be spread readily."
Crucially, Mr Wells said trial data showed there were no negative effects on canola crop yield or oil content when the product was used and also there were no concerns regarding maximum residue levels for export grain.
Victorian Farmers Federation grains group president Brett Hosking said the registration would give growers another option for desiccation.
"It is going to be a little bit cheaper than other options and it is completely safe, so I think it will be welcomed."
He said growers would also like being able to bring in their canola crop evenly, especially in years when there was an uneven break, with different maturities in the paddock.
Previously, growers could use a diquat based product for the job.