Deformation of root system because of flattening, rolling up or injuries during planting are the main causes which predispose the trees to parasitic infections, particularly in case of unfavourable weather conditions occurrence (drought, low temperatures). The objective of the presented work was the determination of the occurrence of pine root deformations in young Scots pine and to verify the presence of root pathogens. Observations were carried out on 20 areas localized in Scots pine stands of Ia class, from which 301 pieces of infected roots were collected. The obtained results confirmed the occurrence of root deformations. It was found that a high percentage of trees had deformed root systems caused by faulty methods of planting which might have contributed to the predisposition of the new trees in the period after planting.

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