As a consequence, dusts can be used effectively in attics, dry crawl spaces, basements, and other places where their use is not potentially hazardous. Commonly used dusts currently registered for silverfish and firebrat control are insecticides such as boric acid, diazinon, bendiocarb, and malathion. Pyrethrin dusts can be used but have shorter residual activity. Dusts are best applied with a hand duster, although boric acid dust can be obtained in an aerosol formulation. Inject dusts into cracks, or spread a thin film wherever the appearance of the deposit will not be objectionable.
Regulations governing the use of pesticides are subject to constant change.
Therefore, it is important to use the insecticide only as specified on the label.