Pest Organisms / Brown-banded Cockroach
When Not To Treat
Hold off on broad chemical treatment until the species and harborage are confirmed — a lone insect with no egg cases, droppings, or repeat sightings may not warrant insecticide. Because the hiding places are spread through a structure, blind spraying without locating harborage tends to fail; identification and inspection come first. Source: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7467.html