The environment today, however, is far more complex, and scientists must resort to raising natural enemies on a large scale to restore an unbalanced insect population in the ecology.
近年省農林廳大量推廣玉米、椰子、茶葉、草莓… … 等經濟作物，這些作物的病蟲害也紛紛跟著種苗、或其它途徑由國外進來，農試所做的也就以引進天敵最多。蟲的口味也很刁國外來的蟲害，國內可能也有同種蟲和天敵。但同種蟲在不同地區會有不同的特性。