Maximum residue limit established for cleavers herbicide in canola

A maximum residue limit is adopted for quinclorac in canola, allowing growers to use quinclorac herbicides to control cleavers.
Top Crop Manager
Tuesday, 28 August 2018
By Top Crop Manager

Canola growers gain a new tool to help control cleavers as the CODEX Alimentarius Commission (CAC) formally adopts a Maximum Residue Limit (MRL) for the active ingredient quinclorac in canola. Growers can now use quinclorac products in their canola to control cleavers. 

Grain companies have omitted quinclorac from 2018/2019 declaration forms. Wade Sobkowich, executive director of the Western Grain Elevator Association, says growers can use herbicides containing quinclorac on canola, according to the application rate and timing on the label, and this crop can now be marketed to Canada’s major export countries.

In light of the international MRL announcement, the Canola Council of Canada advises growers to contact their grain buyer directly before using quinclorac in 2018, or to use other cleavers control methods. In 2016, the Council advised against the use of quinclorac on canola because of ongoing questions about residue limits in one of Canada's largest export markets. The establishment of a international maximum residue limit for quinclorac and canola on July 3, 2018 establishes common standards for growers to follow. 

The Canola Council of Canada's Keeping it Clean website helps growers with regulations, MRLs and other issues relating to trade standards and has a page dedicated to quinclorac and canola. The Council says the larger problem is the lack of consistent global tolerances for pesticide residues and other sanitary/phytosanitary issues.


  • Manage cleavers in canola: In 2016, researchers in Saskatchewan assess the response of cleavers to herbicides such as quinclorac and clomazone, as well as their response to common canola herbicides such as glufosinate-ammonium and glyphosate.

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