Many losses in the agricultural sector all around the world are caused by insect. Pest insect is one kind of pests that damages crop by feeding directly to crop or being a vector of crop diseases. To avoid loss from crop failures caused by insect, an environmentally friendly pest insect management becomes important. This paper provides the illustrations of pest insect management strategies using optimal control approach. A model of insect life stages was used to describe the process of the insect life cycle and 2 control methods were introduced namely green insecticide intervention and mating disruption. A set of differential equations consisting of the state system and adjoin system were derived and used to solve the control problem. This paper discusses four possible scenarios that describe the possible control cost possibilities and examine three types of strategies based on the combination of controls used. Illustrative examples are provided to assess the effectiveness of each strategy in each scenario.