Restricted Entry Intervals (REI) and Preharvest Interval Standards (PHI)
The restricted entry intervals (REI) and preharvest intervals (PHI) for a given material are listed on the product label. Growers are responsible for carefully reading, understanding and following these label requirements and restrictions before selecting and applying a product.
- The same or similar products produced by different manufacturers may not have the same label requirements and restrictions.
- Restricted entry intervals (REI’s) and preharvest intervals (PHI’s) are often the same within toxicity categories; however, some pesticides have product-specific intervals, higher or lower than products within a category.
- Different uses or rates of the same product may have different intervals.
- The REI of a product supercedes the PHI of a product. Example: if the REI of a product is 72 hours and the PHI is 48 hours, you must restrict entry prior to harvest for 72 hours after application.
- When tank mixing products, the most restrictive reentry interval applies.