EN
In 1998 and 2006 seven hundred questionnaires were carried out among the farmers of Central and Eastern Poland. In both periods the decision on the application of insecticides was made after the appearance of noxious insects. Moreover, in 1998 herbicides were also applied in 84.5% of farms after the assessment of weed infestation. However, in 2006 the number of increased farms that applied herbicides as preventive measures grew significantly from 5.2% to 50.7%. In both years fungicides were most frequently applied preventatively: 23.3% and 52% respectively. The use of preventive control measures was especially related to more intensive plant production systems.