From the FarmPlate glossary:
Pesticide-free is an unregulated term used to indicate a product grown without the use of pesticides. Some food producers use this label during their three-year transition phase to Certified Organic, when they are no longer using pesticides and other chemicals but cannot yet label their products as organic. However, without third-party verification this term is unreliable. Although the Certified Pesticide Residue Free label requires that products have no pesticide residues at the point of sale, it does not mean that they were grown without the use of pesticides.