Harris Bed Bug Silica powder is part of the Harris Black Label lineup, a
line of products designed to kill the toughest pyrethroid resistant bed
bugs. If you’ve tried multiple bed bug products with no success, you
may be dealing with a tough-to-kill pyrethroid resistant strain, which
are prevalent throughout the United States. Whereas diatomaceous earth
powder cuts the exoskeleton of the insect causing gradual dehydration,
silica powder pulls the moisture out of the insect. Apply in areas where
bed bugs have been seen. A very, very light dusting is all that is
needed.