Yes, Delta Dust is labeled for roaches and works great. However, you typically will see better results by using additional products along side the Delta Dust. You should apply dust underneath appliances and inside wall voids in the kitchen, but you should not apply dust openly into cabinets and drawers. Our most popular product for the cabinets and drawers that is safe to use around food handling areas is Advion Roach Gel. Below is a link to a great article on the best treatment for roaches.
Non-insecticide methods for scorpion control are:
Harborage Removal- Harborage removal is key to scorpion control and will greatly reduce the numbers of scorpions in the area surrounding the structure, making it far less likely that they will enter. Harborage removal includes eliminating piles of lumber, bricks, and other stacked items that create clusters of tight spaces, elimination of vegetation and other heavy ground coverings near homes and buildings, trimming back tree and shrub limbs from walls and roof, and keeping gutters clear of leaves and other debris.Exclusion- Scorpions and other pests can be kept out of structures to a large degree by installing tight-fitting screens, weatherstripping around doors and windows, and caulking cracks and crevices.