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When you spray a roach, the chemicals, usually a mix of neurotoxins like pyrethroids or pyrethrins, start affecting its nervous system almost immediately. It disrupts the roach’s nerve signals, causing paralysis and eventually death. You'll often see the roach twitch, flip over on its back, and stop moving within seconds to minutes.

Sort of. Hornets are a subsection of wasps with some unique characteristics (along with yellowjackets and similar types of insects). Hornets are generally rare in the United States, with European and Asian hornets the two notable examples.

Hornets tend to be significantly larger than wasps, often larger than one inch. They are also typically white or brown striped instead of yellow like many wasps. They tend to be one of the more aggressive types of wasps, which when combined with their size makes them a priority for homeowners.

Bed bugs typically will not go away on their own. If there are no humans or animals around, they will need to leave to find a host for feeding. But otherwise, bed bugs can live for several months to a year, and the adult females can lay hundreds more eggs in their lifetime. An infestation is only likely to get worse without hiring an exterminator.

Unexplained bites, strange smells, and bug nests in concealed areas warn of potential infestations.