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 farm chemical 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.


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.

Select a Crop Type

Already sprayed? Calculate how long to wait.


Have a deadline? Find a pesticide to suit your timeline.

Sync Your Calendar

If you are using Outlook or an iPhone you can download your swath date ICS file to sync with your calendar.

Embed this calculator on your website

Embed the Spray to Swath calculator on your own site to help protect the quality of your customer's harvest and that of the Canadian canola and pulse industries.