Requirements from point of theory On the basis of the principles of the agricultural eco-system,decrease injury caused by pest insects to the smallest degree possible by adjusting related factors affecting pest insects in eco- system so as to ensure a higher quality and quantity of agricultural production.i.e. first-rank economic efficiency,ecological efficiency and social efficiency. 13 Requirements from point of theory Requirements from point of theory On the basis of the principles of the On the basis of the principles of the agricultural eco agricultural eco -system, decrease injury system, decrease injury caused by pest insects to the smallest caused by pest insects to the smallest degree possible by adjusting related degree possible by adjusting related factors affecting pest insects in eco factors affecting pest insects in eco - system so as to ensure a higher quality system so as to ensure a higher quality and quantity of agricultural production. i.e. and quantity of agricultural production. i.e. first -rank economic efficiency, ecological rank economic efficiency, ecological efficiency and social efficiency. efficiency and social efficiency