Diatomaceous Earth will be a great portion of a roach control program. The insect must come in contact with the product or ingest it. This results in loss of body fluids then dehydration. Therefore, there is not a specific time of kill it depends on when they come into contact with the dust. If left undisturbed, the dust will last for many months.Dust should be applied in a very thin layer. If you can see the dust, you applied too much. We recommend using one of our Roach Control Kits for the necessary products for treatment inside and outside the home. This will offer a residual of up to 3 months indoors and monthly outdoors. The bait that is included will be applied every 2 weeks.
The Diatomaceous Earth 85% - 4 lb. bag for solid coverage (a light, dosing broadcast outside and inside) will cover of 800 sq. ft.
Diatomaceous Earth 85% can settle within 30 minutes to 1 hour when applied as directed on the product label.