What is a withholding period?
A withholding period (WHP) is the time period that is set at registration for a chemical, to guide users of the chemical as to when residues will be below the MRL. It is based on the rate at which the chemical breaks down on the crop/animal. It is the minimum length of time between treatment of a crop or animal, and the suitability of the harvested crop or the animal product for human consumption.