Precor IGR Concentrate (10) 1 oz. bottles Methoprene 1.2% Precor IGR Concentrate can be applied wherever fleas are found or may be harboring. Apply at a rate of 1 oz per 1 gallon of the diluted spray solution per 1500 sq ft of surface area with any low pressure sprayer with a fan tip that is typically used for indoor applications. Prevents adult flea emergence (by preventing flea eggs and larvae from maturing) for up to 7 months as long as carpet is not shampooed or steam cleaned. This means if a flea egg drops off of infected dog, flea egg will not develop. 3 year shelf life.