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Calculate pre-harvest interval and safe harvest date based on pesticide application date and product PHI requirements.
Calculate pre-harvest interval and safe harvest date based on pesticide application date and product PHI requirements. Get instant, accurate results for your farm.
Enter pesticide application date, pre-harvest interval (PHI) in days (from pesticide label), and re-entry interval (REI) in hours (from label). Click calculate to see earliest safe harvest date, earliest safe re-entry date/time, and days remaining until safe harvest.
The pesticide safety interval calculator helps you determine safe harvest dates and re-entry times after pesticide application. It calculates the pre-harvest interval (PHI) — the minimum days between last application and harvest — and the re-entry interval (REI) — when workers can safely re-enter treated areas. Compliance protects consumers and workers from pesticide exposure.
A: The PHI is always listed on the pesticide label under "Directions for Use" or "Restrictions." Look for "Pre-Harvest Interval" or "Days to Harvest." The label is legally binding — never harvest before the PHI expires. If the label lists different PHIs for different crops, use the one for your specific crop.
A: No. Washing removes surface residues but cannot remove systemic pesticides that have been absorbed into plant tissue. The PHI accounts for both surface and internal residue degradation. Harvesting early is illegal and can result in produce rejection, fines, or health hazards. Always wait the full PHI.
A: Use the LONGEST PHI among all pesticides applied. For example, if you applied an insecticide with 7-day PHI and a fungicide with 14-day PHI, wait 14 days before harvest. Keep accurate records of all applications (date, product, rate, crop, growth stage) — this is required by law and essential for traceability.