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Determine the Right Pre-Harvest Interval

When problems pop up during the growing season, such as weeds, pests or crop disease, you’ll want to nip them in the bud early on to ensure your harvest isn’t affected in the fall. Whether you’re applying an insecticide, fungicide, desiccant or herbicide, application timing is a crucial consideration for complying with the product’s pre-harvest interval, or PHI (the time between chemical application and when the crop is swathed, desiccated or straight-cut).

Export markets have strict regulations on the amount of trace residues they allow on various crops and will reject any imports that do not meet these parameters. To help protect the integrity and reputation of Canadian agriculture in the global market, ensure that you meet the guidelines set out for your specific crops and follow the instructions on product labels. 

Spray to Swath

Spray to Swath Interval Calculator

Keep it Clean! has a handy PHI calculator to help producers determine how many days are required between pesticide application and cutting. You can find calculations for products you’ve already applied, use a calendar to specify what and when you plan to spray and when you can harvest, or find product options based on your needs and timelines. There are numerous products to choose from when scrolling through the lists on this site, making it easy to find what you’ve already used or discover a new solution that will work for you and your crop.

You can find the PHIs for the majority of ADAMA’s products with this tool, however, Keep it Clean is responsible for updating this tool and we recommend you always review each product’s label for the most up-to-date information on PHIs. 

Whether you’re looking to maximize your crop export potential or are just seeking helpful tips to ensure PHI compliance, these resources are a great starting point.

Keep it Clean is a joint initiative of the Canola Council of Canada, Cereals Canada, Pulse Canada and the Prairie Oat Growers Association, providing growers and crop advisers with resources for growing market-ready crops. Let’s all work together for a strong and safe Canadian ag sector.