Method for making a coreless packaging substrate are disclosed in the present invention. At end portions of the frame members to be joined, at the joining region, thickened parts which project toward the rotary body joining tool are provided. Some circuitry limits voltage across the elements and provides a return charge channel to prevent depolarization. The insecticide packet is provided with a plurality of pins extending outwardly from the packet to discourage non-targeted animals from attempting to ingest the envelope or its contents.