Excessive concentration in the crop rotation of sugar beet, potato or rape (usually 33%, and sometimes 50%), with cultivation most often carried out without manure, near the processing plant, as well as improper selection and sequence of species in rotation contribute to a significant increase in the risk of the sides of beet nematode, potato nematode (quarantine nematode), cabbage syphilis protozoan and other dangerous pests, and also lead to a negative soil organic mass balance. Plant cultivars resistant to the mentioned pests make it possible to limit crop losses, but unfortunately they multiply most often pests in the soil (except for the potato nematode Ro1). Chemical control of nematodes and protozoa in the soil is not possible under IPM. In the EU countries - the leading producers of sugar beet, more than 60% of the cultivation area of this species is covered with plants of fertilization and phytosanitary importance, while in Poland only 15.4% (Zimny et al., 2017). The share of oilseed radish in catch crops is 11% abroad, and in Poland it is below 0.1%. Actions should be taken to change this unfavorable share of catch crops, including oilseed radish, in Poland. The situation is similar with regard to the cultivation of catch crops and radish in rotation with potatoes and rape in Poland and abroad.
