Scientific Sessions of the Institute of Plant Protection in Poznań, performed for 50 years, create a good oportunity to present the newest directions and achievements in plant protection. Presentation of scientific studies, discussion on needs and problems of plant protection practice, are main purposes of conference meetings. A wide range of session participants is usually represented by: distinguished specialists from national and foreign research centres, authorities, national office workers, advisory services as well as individual farmers. Scientific Sessions initiated by Prof. Władysław Węgorek – a long-time director of the Institute of Plant Protection, and continued by his successors, have a great influence on research directions and plant protection practive in Poland.