Heat LQ, OK for pre-harvest application on wheat, durum and barley

Maximum Residue Limits have been set for Heat LQ applied on wheat, durum and barley

BASF’s Heat LQ herbicide can now be used pre-harvest in Canada on wheat, durum and barley without potentially hurting export markets, BASF Canada said in a news release Aug. 17.

Maximum Residue Limits (MRLs) for Heat LQ as a harvest aid in cereals has been set by the CODEX Alimentarius Commission (CAC), a United Nation’s agency that establishes food safety rules.

“This allows BASF to establish MRLs in all major export markets to support the use of Heat LQ as a pre-harvest herbicide in wheat and barley with glyphosate,” the release said.

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“Canadian wheat and barley growers can now use Heat LQ as a harvest aid with full export market access,” said BASF Canada’s Cereal Crop Manager Dan Packer in the release.

Until now Heat LQ, although registered for use in Canada, was on a list of products Canada’s grain industry didn’t want used because of the lack of MRLs. Without MRL’s there’s a risk buyers could reject treated crops.

“With the recent establishment of CODEX MRLs for Heat LQ as a pre-harvest herbicide in wheat, durum and barley, grain companies will now omit those crops from the 2017-18 (crop year) declaration forms,” Wade Sobkowich, executive director of the Western Grain Elevator Association (WGEA), said in an interview. “Growers can now use Heat LQ as a pre-harvest application on wheat, durum and barley and these grains can be marketed to Canada’s major export countries.”

Before farmers can deliver grain in a new crop year to WEGA-member companies, they must sign a form declaring the crops they deliver have not been sprayed with certain products.

However, the WGEA still doesn’t want farmers applying Heat LQ to flax pre-harvest, Sobkowich added.

Cereals Canada welcomed the change.

“This will now allow Canadian (cereals) farmers to have access to this technology,” president Cam Dahl said in an email.

Heat LQ provides wheat and barley growers with another tool to dry down tough broadleaf weeds including volunteer Roundup Ready canola, redroot pigweed and wild buckwheat, BASF said.

A pre-harvest application of glyphosate and Heat LQ will provide complete and rapid dry down of tough weeds to improve harvest efficiency, the company said.

Heat LQ can also be used as a pre-seed, pre-emergent and chemfallow herbicide.

Other products remain on the WGEA’s prohibition list:

  • chlormequat (Manipulator plant growth regulator) on wheat or any other cereal,
  • quinclorac (including Clever Dry Flow Herbicide) on canola,
  • metconazole (including Quash fungicide) on canola,
  • fluoxastrobin (including Evito fungicide) on soybeans, and
  • benzovindiflupyr (Solatenol) (including Elatus Co-Pack or Trivapro Co-Pack fungicide) on soybeans.

Farmers are also being urged to follow label directions, including rates and timing when applying pesticides that grain end-users allow to avoid exceeding permitted residue levels. That includes glyphosate, Cereals Canada’s website says.

“Glyphosate has come under increased scrutiny, when compared to other pesticides, due to recent media attention generated by those who do not support the use of pesticides for any reason,” Cereals Canada’s website says, “Unlike many products applied in fall, applying glyphosate when kernels are too green — 30 per cent moisture or above — can result in residues that are greater than the maximum allowable limit.”

Farmers can reduce glyphosate residues by following label directions, which includes not applying glyphosate to cereals when kernels are 30 per cent moisture or greater in the least mature areas of the field.

Farmers should also abide by the pre-harvest interval.

“Some customers have contract limitations on fall application of glyphosate” Cereals Canada says. “Talk to your grain buyers to ensure they know what crop protection products you intend to use, and to confirm that none of these products will cause concern for export or domestic customers.”

Farmers can get more information on preventing pesticide residues on cereals, canola and pulse crops at the Keeping it Clean website.

Pulse crops are more complex with some pesticides being allowed on some pulses and not others. Find detailed information on that at the Keeping it Clean website or view and download this PDF from the Pulse Canada website.

About the author


Allan Dawson

Allan Dawson is a reporter with the Manitoba Co-operator based near Miami, Man. Covering agriculture since 1980, Dawson has spent most of his career with the Co-operator except for several years with Farmers’ Independent Weekly and before that a Morden-Winkler area radio station.



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