Ortho home defense is designed to last and control insects like ants, roaches, and spiders for up to 12 months. Use ortho® home defense® insect killer for lawn & landscape to get rid of any visible ant nests in your yard. Pin On Pest Control Gear In this manner, how does ortho home defense kill bugs? How does ortho home defense work on ants . I leave the window open and in the 2 months since i applied it, i haven't seen any ants come in, nor any ants even near the window. Besides controlling general termites, it is effective against subterranean termites, carpenter ants, and bees. Ortho home defense max insect killer, 1. Ortho home defense is designed to last and control insects like ants, roaches, and spiders for up to 12 months. Ortho® home defense® insect killer for indoor & perimeter 2 with comfort wand® will also kill any carpenter ants already in your house that come in contact with it. Create a bug barrier with ortho® home defense® insect killer for indo...