PHI is the minimum waiting period between the last pesticide application and harvest. Harvesting inside PHI is one of the fastest paths to MRL failures, buyer rejections, and audit non-conformities.
Common PHI examples (verify label for your product)
- Imidacloprid (aphids): often 14+ days on roses
- Lambda-cyhalothrin (thrips): often 7+ days
- Difenoconazole (powdery mildew): often 21+ days
How FarmTrace enforces PHI
Supervisors log spray events with product and section. FarmTrace calculates earliest_safe_harvest_date and blocks harvest entry server-side when a section is inside PHI. The harvest form shows a live warning before submission.