Which product works best on roaches coming in from outside?
The best product we have for the larger cockroaches, or American cockroaches, is a product called Demon WP. Demon WP is a wettable powder that you mix with water in a one gallon sprayer. Wettable powders are easier for the roaches to pick up on their bodies, and they pack more of a punch which is what you need when treating for larger roaches. Since the larger roaches come from the outside, you want to concentrate your spray on the outside of the house. Spray 2 to 3 feet up onto the foundation and 2 to 3 feet out onto the ground. You can also treat inside the rooms where you have issues. Demon WP is not only labeled to treat roaches, but almost any other insects you may have a problem with including spiders, ants, silverfish, etc. You should apply once a month for best results.
Answer last updated on: 07/28/2011