Long term experiments were conducted with sugar beet on fields with 2- (sugar beet spring cereals), 3- (sugar beet, spring and winter cereals) and 4-years crop rotation (sugar beet, spring cereals, maize for a green crop, winter cereals). Nematode and aphids’ population number, damage caused by beet fly and flea beetle were recorded on each tested field. Increasing of sugar beet frequency in a crop rotation resulted in a significant increase of beet nematode number. In 2-years rotation it was 2.3-times higher then in 3-years rotation and 3.5-times higher comparing to 4-years rotation. Shortage of crop rotation affected the yield of roots and sugar content. The highest reduction was stated in the case of 3-year rotation, possibly due to a high straw content in the soil. The level of leaf damage caused by pests and diseases was determined by weather conditions during the experimental years. The rotation had no any influence on it.
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