Kitt from Phoenix, Az writes
Onslaught Insecticide does not kill on contact. The active ingredient releases slowly over time, allowing the pests to pick up the residual and carry it back into wall voids, cracks and crevices, and other spots where they may hide, so that it can be spread further through the population. We do recommend that you also use an IGR (insect growth regulator), such as Gentrol IGR, along with your insecticide to also stop the roaches' reproductive cycle while the insecticide is working to kill the adult population.
Answer last updated on: 12/14/2016
