In the natural world, the primary killers of insects are biological predators and pathogens, specifically other insects like dragonflies, spiders, and birds, alongside fungal infections that can decimate entire colonies. However, in human-controlled environments, chemical insecticides—particularly those containing pyrethroids or neonicotinoids—are the most lethal tools used. These chemicals target the nervous system of the bug, causing paralysis and eventual death. Beyond chemicals, "desiccants" like Diatomaceous Earth are incredibly effective; they consist of microscopic, sharp silica particles that cut through the insect's waxy exoskeleton, causing them to dehydrate and die from the inside out. In 2026, integrated pest management also leans heavily on environmental controls, such as extreme heat treatments (often reaching 50°C for bed bugs) or the use of "sticky traps" and pheromone disruptors that prevent mating. While many people think of "squashing" as the main killer, it is actually the invisible chemical and biological warfare occurring at the microscopic level that maintains the global balance of the insect population.