A collector of adult insects, their eggs and larvae has a vacuum-producing motor disposed within a housing. An inlet nozzle is used to draw the targeted organisms into the housing along a flow path featuring grids heated to a degree sufficient to kill the organisms. Mechanicla expedients such as fan blades can be disposed in the flow path to apply mechanical killing forces and to blow debris off of adjacent grids. The organisms are directed to a collector which can be heated and which can contain insecticidal substances to provide additional killing expedients for the collected organisms. The flow rate and temperature ranges are adjustable to create sufficient heat and time of contact to kill selected organisms. The collector is especially useful for treating bedbug infestations without the need for toxic chemicals, long-term treatments which make the space being treated uninhabitable and other more extreme treatment regimens.