PF Harris 1-Gallon Bed Bug Killer. This ready-to-use insecticide effectively eliminates even the toughest pyrethroid-resistant bed bugs. Its powerful formula kills bed bugs and their eggs, breaking the lifecycle and preventing future infestations. Apply as a spot treatment to cracks and crevices, bed frames, box springs, dressers, closets, carpet edges, wall moldings, behind headboards, pictures, and luggage. The active ingredient, Imidacloprid, ensures maximum efficacy.