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The pre-harvest interval is the minimum number of days that must pass between the last pesticide application and harvest so residues fall below the maximum residue limit. Adding a few days of buffer absorbs slow degradation in cool or cloudy weather and gives margin against a residue test failure.
Pre-harvest interval
Earliest legal harvest = last application date + PHI days; recommended = + safety buffer
The pre-harvest interval is a legal requirement, not a guideline. Always use the interval printed on the label for your crop and jurisdiction, and keep records of every application date.
Residues are likely to exceed the MRL. The consignment can be rejected, recalled or destroyed, and repeated failures can cost market access for a whole region.
Yes. The same active ingredient can carry very different intervals on grapes, tomatoes and cereals because residue decline and MRLs differ. Always read the crop-specific line on the label.