Cynoff WP is not labeled for bedbugs so we cannot recommend you use it for bedbug control. For more information on a successful bedbug treatment program, please review our article on How to Get Rid of Bedbugs.
Cynoff WP has been discontinued by the manufacturer.
A product that is labeled to be used in your lawn for hornets and wasps is Bifen I/T. It can be broadcast across the lawn as well as used inside around the cracks and crevices as well.
The red worms would actually have to come in contact with the Cynoff Wp for it to kill them.