Abstract: Gas-permeable 100% reinforced thermosetting polyester film material for the manufacture of pest control applicators, comprising a grid including a base of polyester yarn overlain with top and bottom layers of polyester fibers, and an aqueous-based paste of the same polyester filling the spaces between the grid yarn and fibers and having a melting point lower than the grid yarn and fibers polyester. A pest control applicator is formed of such film material, filled with pest control agent reactive with water to release a fumigating gas, and after reaction of the pest control agent with air humidity, the applicator is immersed in water to deactivate residial pest control agent.