The directions for outdoor perimeterl use in 1 gallon of spray indicate 1.2 oz per gallon of water. Since it is difficult to say exactly how much that is, I recommend using about 1 Tablespoon per gallon of water.

Also Know, what is the active ingredient in Orthene? Acephate

Also Know, how do you mix acephate?

Answer: For outdoor and perimeter spray excluding residental turf with Acephate 97UP Insecticide the rate is 1.2 oz per gallon of water.

How long does orthene last?

Acephate dissipates rapidly with half-lives of <3. and 6 days in aerobic and anaerobic soils, respectively.