Learn more about COVID-19 in Saskatchewan:

Google Translate Disclaimer

A number of pages on the Government of Saskatchewan's website have been professionally translated in French. These translations are identified by a yellow box in the right or left rail that resembles the link below. The home page for French-language content on this site can be found at:

Renseignements en Français

Where an official translation is not available, Google™ Translate can be used. Google™ Translate is a free online language translation service that can translate text and web pages into different languages. Translations are made available to increase access to Government of Saskatchewan content for populations whose first language is not English.

Software-based translations do not approach the fluency of a native speaker or possess the skill of a professional translator. The translation should not be considered exact, and may include incorrect or offensive language. The Government of Saskatchewan does not warrant the accuracy, reliability or timeliness of any information translated by this system. Some files or items cannot be translated, including graphs, photos and other file formats such as portable document formats (PDFs).

Any person or entities that rely on information obtained from the system does so at his or her own risk. Government of Saskatchewan is not responsible for any damage or issues that may possibly result from using translated website content. If you have any questions about Google™ Translate, please visit: Google™ Translate FAQs.

New Option for Pre-emergent Kochia Control in Wheat and Durum

By Mitchell Japp, PAg, Provincial Specialist Cereal Crops, Regina and Clark Brenzil, PAg, Provincial Specialist Weed Control, Regina

Pre-seeding herbicide application.
Pre-seeding herbicide application.

Kochia is becoming increasingly difficult to control due to the development of herbicide resistance. A new herbicide option for pre-emergent control is now available for use.

Authority 480 herbicide just recently received registration for pre-emergent use on spring wheat and durum wheat. Producers that have used Authority 480 in pulse crops, flax or sunflowers will be familiar with the product, but the use in spring wheat and durum is new.

Authority 480 can be applied to the soil surface prior to seeding, or up to three days after seeding (prior to emergence) to control emerging weeds. Note that only the low rate of 219 mL/ha (88 mL/acre) is approved in spring wheat and durum for kochia control only. However, there are several caveats that must be observed. The product is not suited to all areas or on all soil types. The product should not be used under the following conditions:

  • On soils that are classified as coarse-textured soils;
  • On soils that are fine-textured with less than 1.5 per cent organic matter;
  • On soils with an organic matter content greater than six per cent; or,
  • On soils that have a pH of 7.8 or greater.
Kochia seedling
Kochia seedling

Authority 480 herbicide is a Group 14 herbicide, with the active ingredient sulfentrazone included at 480 g/L. The product is soil applied with a minimum of 100 L/ha water (40 L/acre); the herbicide is taken up by roots and shoots of the weeds emerging from seed after application.

Layering herbicides can be an effective strategy to decrease the risk of escaped weeds that can build up populations of resistant types. Herbicide layering involves the use of herbicides from two or more modes-of-action (herbicide-resistance groups) for control of certain weeds at risk of developing herbicide resistance. The herbicide layering concept can utilize herbicides applied in the same season, whether herbicides are applied to the soil, as a pre-emergent surface, as an incorporated treatment or as a post-emergent foliar application.

We need your feedback to improve saskatchewan.ca. Help us improve