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Keeping Record of Herbicide Applications

By Eileen Beaton, PAg, Crops Extension Specialist, Weyburn

June 2024

There are many benefits to keeping record of all pesticide applications, including planning crop rotations as it relates to herbicides. Some herbicides break down quickly or are bound tightly to soil, preventing them from causing problems for subsequently seeded crops. Others referred to as ‘residual herbicides’ have rotational crop restrictions that are outlined on product labels. These need more time and in-season rainfall to break down in the soil. Good records help producers address these restrictions when planting their crops the following season. The Ministry of Agriculture provides a sprayer logbook template to assist with keeping records. This allows applicators to record information about their sprayers, environmental conditions at time of spraying along with field and pesticide information. It also includes information about mixing pesticides and sprayer cleaning.

Sprayer on edge of field
Pre-harvest herbicide applications

Producers should consider potential herbicide carryover from applications done in previous growing seasons, due to dry conditions. Less than normal rainfall can cause residual herbicides to remain in the soil at higher levels than expected. This increases the potential for herbicide injury to sensitive crops registered for planting the following year(s). Our herbicide residues webpage has more information about herbicide carryover including risk level maps. Other benefits of keeping accurate records of herbicide application include:

  • Assessing how well your herbicides worked:
    • Producers can consider the product used, rate applied, environmental conditions and crop or weed growth stage at time of spraying and adjust as needed. Records can also help determine if weeds may have gotten missed during applications or if any may be potentially developing resistance.
  • Having access to records if needed:
    • Producers can refer to their records if an incident including herbicide drift occurs due to application errors. While producers should assess potential of herbicide drift before spraying, having access to records can ensure that any potential errors can be resolved effectively.
  • Rotating herbicide modes of action:
    • Producers can refer to their records to help rotate effective modes of action. This delays or prevents herbicide resistance.

There are many benefits to keeping accurate records of pesticide applications. Consider using the sprayer logbook template for all your pesticide applications.

For more information about keeping record of pesticide applications or herbicide carryover, contact the Agriculture Knowledge Centre at 1-866-457-2377 or visit your local crops extension specialist.

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