Spray to Swath Interval Calculator

The Spray to Swath Interval is the minimum number of days that must pass between product application and cutting your crop by swathing or straight-cutting.

On pesticide labels, you’ll see it referred to as the pre-harvest interval or PHI. Cutting before this interval has lapsed can leave unacceptable residues on harvested seed. To protect the marketability of your crop, always stick to the PHI, for every crop protection product you apply.

Use the tool to calculate PHI: Enter the crop type and the product you have sprayed, and the calculator will tell you how many days after application you must wait to cut your crop.

Use the tool to find a product to suit a specific timeline: Enter your crop type and pesticide type, then drag the slider to indicate when you would like to cut the crop. The calculator will tell you which (if any) products can be applied to meet that timeline.

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.