EN
The paper was written after a 4 month practice in Swiss Federal Station for Agronomy 'Zurich-Reckenholz' in 1995. Swiss ecological methods and computer Decision Support Systems (DSS) used for plant protection are presented. Ecological methods describe the protection against selected seed bome, soil borne and atmospherically transmitted diseases. Discussed computer models EPOVIR, EPIPRE, HORDEPROG and PHYTOPRE are used in operational scale for protection of winter wheat, winter barley and potatoes.