Evergreen 1% Pyrethrin Dust Insecticide with 1 Puffer Bellow Hand duster, 10 Ounces Pyrethrins 1.00% Evergreen Pyrethrum Dust is for use in and around animal areas, apartments, barns, buildings, buses, cabins, colleges, commercial buildings, day care centers, food processing plants, food storage areas, granaries, homes, hospitals, hotels, nursing homes, office buildings, restaurants, schools, supermarkets, warehouses, and many other listed areas. For the control of crawling insects apply Evergreen Pyrethrum Dust at the rate of 1.5 ounces per 50 square feet of surface area, into voids, cracks and crevices or other places where insects are traveling or harboring. For severe infestations apply behind cabinets and walls, in crawl spaces and attics at the rate of 16 to 20 ounces per 1,000 square feet.