EN
During the last 20 years, Polish scientific papers on crop protection were rarely dealt with migration biology and crops’ infestation by arthropods. In presented paper research methods of insect’s migration were discussed as well as difficulties in statistical inference based on the migratory behaviour of oilseed rape pests (SADIE). Studying arthropods migrations by comparing groups of measuring points parallely placed in increasing distances from the edge of field, is not very useful. Such approach considers a priori a regular insects movement into crop canopy. Presented results, are based on research conducted earlier.