Resources to grow market-ready crops

You can protect your investments and help to maintain market access for all by carefully planning and managing your pre-harvest glyphosate applications. Glyphosate is an effective tool for pre-harvest weed control and is not to be used as a desiccant.

Where allowed, always wait until grain moisture content is less than 30% in the least mature areas of the crop before applying pre-harvest glyphosate. Applying pre-harvest glyphosate too early can result in unacceptable product residues in the harvested grain, which can create market risk.

Managing the Pre-harvest Application of Glyphosate

Keep it Clean recommends the following practices to manage the pre-harvest application of glyphosate for canola, pulses and cereals (except malt barley):

  • Glyphosate is registered for pre-harvest weed control and is not to be used as a desiccant.
  • Pre-harvest glyphosate should only be applied for weed control once grain moisture is less than 30% in the least mature part of the field.
  • To avoid unacceptable residue levels, always follow the product’s label for application rate, timing and pre-harvest interval (PHI).
  • Never harvest earlier than recommended – this can increase the risk of excess glyphosate residues in harvested grain.
  • When using glyphosate for pre-harvest weed control in a tank mix with other products, such as Saflufenacil (e.g. Kixor®, Heat), the products must still be applied when grain moisture content is less than 30% in the least mature part of the field; always follow the PHI of the most restrictive product label.

Determining if a crop is ready for application pre-harvest glyphosate

Canola

Pre-harvest glyphosate should only be applied once grain moisture is less than 30% in the least mature areas of the field.

pdf Download the Pre-Harvest Glyphosate Staging Guide for Canola (755 KB)

By waiting until 50–60% seed colour change, you can be confident grain moisture will be less than 30%. At this stage seeds in the main stem will be green and firm to roll in the top third of the plant, mostly brown with some speckling in the middle third, and completely brown-black in the bottom third.

Canola Pods Visual Reference

Recommended harvest: typically seven days after application.

Watch a video of an in-field assessment:


Cereals

Warning Glyphosate is a product of concern for wheat, barley and oats. Some customers have contract limitations on pre-harvest application of glyphosate. Talk to your grain buyer to confirm that an application of pre-harvest glyphosate will not cause concern for domestic or export customers.

Warning Be Informed: Oats may not be accepted if treated with pre-harvest glyphosate – always check with your grain buyer before applying.

Do not use Do not Use: Buyers may not accept malt barley if treated with pre-harvest glyphosate.

pdf Download the Pre-Harvest Glyphosate Staging Guide for Cereals (1.07 MB)

Where allowed, glyphosate can be applied once seed moisture is less than 30% in the least mature areas of the field to avoid unacceptable residue in the harvested grain. At this stage, the seed is firm and reasonable pressure from your thumbnail will leave a dent in the seed (i.e. hard dough stage).

Cereals Thumbnail Test

Never harvest earlier than recommended; usually seven days after application. Check the product label for the recommended PHI.

Watch a video of an in-field assessment:


Pulses

Warning Glyphosate appears on the 2020 Pulse MRL Advisory for all pulse crops. Consult with your grain buyer before using, as some grain buyers may not accept pulse crops treated with pre-harvest glyphosate due to scrutiny in the global marketplace and low MRLs for some pulse crops in certain major markets.

Glyphosate can be applied once seed moisture is less than 30% in the least mature areas of the field to avoid unacceptable residue in the harvested grain.


Here’s what 30% looks like:

  • Chickpeas

    Plants are yellowed with mature pods. Seeds have changed colour and detached themselves from their pods; pods rattle when shaken.

    Plants are yellowed with mature pods. Seeds have changed colour and detached themselves from their pods; pods rattle when shaken.
  • Dry Beans

    80-90% of the leaves have dropped and pod colour change (to mature colour) is 80%; upper pods are yellow and seed rattle in the lowest pods. Seeds have lost their green colour when split.

    At 30%, 80-90% of leaves are lost and 80% of pods are yellow. Seed is white inside.
  • Faba Beans

    Leaves are drying down and stems are green to brown in colour; lower pods are dark brown/black.

    At 30%, leaves are drying down and stems are green to brown in colour; lower pods are dark brown/black.
  • Lentils

    80% of the plant is yellow to brown. Seeds from the top third of the plant are fully-formed and firm; seeds from the bottom third are hard and tan-brown; pods rattle when shaken.

    80% of the plant is yellow to brown. Seeds from the top third of the plant are fully-formed and firm; seeds from the bottom third are hard and tan-brown; pods rattle when shaken.
  • Peas

    Most pods (80%) are yellow/golden brown; seeds in bottom pods are detached and rattle in pod.

    Never harvest earlier than recommended. The PHI for glyphosate on all pulse crops is seven days and harvesting earlier than the PHI may increase the risk of excess residues in the harvested grain. Check the product label for further information and guidelines for the proper application rate and use of pre- harvest glyphosate for weed control.

    Most pods (80%) are yellow/golden brown; seeds in bottom pods are detached and rattle in pod.

Watch a video of an in-field assessment:


Help Keep Glyphosate in the Grower’s Toolkit

Glyphosate is an effective and valuable tool, but it is under scrutiny in the global marketplace. By using glyphosate correctly and adhering to the Keep it Clean pre-harvest glyphosate guidelines, you can help to ensure the quality and marketability of Canadian canola, cereal and pulse crops, and keep this product available for years to come.

Correct product use is just one of the ways you can avoid market risk and protect your investment. Always read and follow the label for every crop protection product you apply.