New canola weed control option

12 Oct, 2014 11:00 PM
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13
 
The issue of weed seed set is particularly important when considering weeds like annual ryegrass

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.

FarmOnline
Gregor Heard

Gregor Heard

is the national grains writer for Fairfax Agricultural Media
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READER COMMENTS

wtf
13/10/2014 4:55:05 AM

Can anyone tell me how many times and for what reasons the MRLs have changed since the joint FAO/WHO meeting on Pesticide Residues since 1979? seems to me it was hard to establish these are the guidelines we use after several failed links from the Food Standards Aust and APVMA website.
JJ
13/10/2014 5:23:42 AM

Added toxic glyphosate. It appears a very good reason to steer clear of canola oil and any processed foods containing canola oil.
Fred Haskins
13/10/2014 6:20:38 AM

Ironically there is no mention of a with holding period for livestock consuming, canola trash which has been applied with either Roundup or Paraquat, or in the case of the Marsh v Baxter Propyazimine, Are the neighbours of Canola growers who use this herbicide regime expected to be required to collect Canola trash that has blown onto their properties, so as not breach MRL limits in their livestock
Jeffito
13/10/2014 7:26:51 AM

Fred. Just maybe these issues were considered in reaching the decision described in the article? In any case, roundup is probably better in health and residue effects than paraquat? What I would like to hear from an expert grower is whether roundup can be used a dissicant on RR canola. Also, can chemical desiccation remove the need for swathing and the extra diesel needed for this process? An interesting calculation in grower costs and carbon footprint.
Hick from the sticks
13/10/2014 12:05:44 PM

Roundup has a seven day withholding period for grazing, Paraquat, one day. Toxic glyphosate? Somebodies been reading too many fairy tales on the net.
Fred Haskins
13/10/2014 2:05:57 PM

Jeffito Roundup affects the fertility of the seed, harmless?
Jeffito
13/10/2014 2:51:13 PM

Hick, I'm not sure what your position is from your statement. Based on lethal dose 50 data, paraquat is more than 150 times more lethal than roundup if you accidentally drink either. Fred, does roundup affect seed fertility (of rye grass I presume you mean) or simply kill the parent plant before it seed is ripe?
Jeffito
13/10/2014 2:51:13 PM

Hick, I'm not sure what your position is from your statement. Based on lethal dose 50 data, paraquat is more than 150 times more lethal than roundup if you accidentally drink either. Fred, does roundup affect seed fertility (of rye grass I presume you mean) or simply kill the parent plant before it seed is ripe?
wtf
13/10/2014 5:57:26 PM

Jeffito, do they regularly test our food for MRLs and what toxicology data do they compare these to?(I read it was the JPMR where they get these values from), LD50 would be useless as part of this testing wouldn't it? cancer and other illnesses can take years to become apparent and no one sits down to drink litres of roundup or paraquat. To me it would be more relevant to study the exposure over a period of time of much smaller concentrations and their effect on our health, whilst considering interactions with other residues/chemistry in our diets.
Moondog
14/10/2014 8:08:28 AM

Before we go off making broad statments about how safe glyphosate is take a look at this interview with Soil Pathologist Dr Don Huber from Purdue University http://www.youtube.com/watch?v=EN mc9kHnvbo
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