In tests of malathion as a protectant for raisins against insect infestation during drying and storage, paper trays were impregnated with malathion and grapes were dried into raisins on them. The results of the study indicated that malathion-treated trays were effective in protecting the raisins from insect attack during the drying period, and that sufficient malathion migrated to the raisins to protect them from insects for 1 year in farm-type storage.