Pre-Harvest Interval Calculator
Use the tool to find a product to suit a specific timeline
Enter your crop type and pesticide type, then use the slider to select when you plan to cut. The calculator will tell you which products (if any) can be applied to meet that timeline.
Always read and follow the product label for application rate, timing and PHI before applying any crop protection product.
If you don’t see a registered product that you are looking for, or notice an error in the calculator, please let us know. Contact info@keepitclean.ca.
When tank mixing, each tank mix partner is applied in accordance with its registered product label. In cases where information on the tank mix partner labels differs between them, the most restrictive directions must be followed.
Calculate how many days you need to leave between pesticide application and cutting.
FAQs
What is a pre-harvest interval (PHI)?
The pre-harvest interval (PHI) is the minimum number of days that must pass between applying a pesticide and cutting your crop by swathing or straight‑cutting. You’ll find the PHI listed on crop protection product labels as pre-harvest interval or PHI.
How long after spraying can I harvest?
Use the PHI calculator to plan harvest timing. Enter your crop type and the product you’ve applied. The calculator will tell you how many days after application you must wait before cutting your crop.
Why are PHIs important?
PHIs are set to ensure a product’s active ingredient has enough time to break down in the plant and does not leave unacceptable residues on harvested seed. Cutting before the PHI has lapsed can result in residue levels that may not meet market or regulatory requirements.
What happens if a PHI is not followed?
Harvesting before the PHI has passed can result in unacceptable pesticide residues, putting market access at risk.
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