Seedlings produced with a covered root system were intended to be used in the afforestation of ‘difficult’ soils in post−agricultural lands, on post−fire areas, in wastelands, within zones of industrial damage or on mining heaps. It is assumed that the suitable substrate and properly grown seedling ensure a good start for a plant in a new, unfavorable environment. In many forest districts so−called ‘container nurseries’ were established and produced millions of seedlings with a covered root system, including seedlings equipped with mycorrhiza under them, controlled mycorrhization. In recent years, however, more and more often such seedlings are also introduced into forest soils during the renewal of logging or gaps. Phytopathology sees many weaknesses of such an approach. The article indicates potential and actual threats in the production cycle of planting material in containers and after planting trees in cultures.
Obserwacje stopnia zagrożenia plantacji burka cukrowego przez przędziorka chmielowca prowadzono od czerwca do września 2014 roku. Lustracji poddano 662 plantacje położonych w trzech południowych powiatach województwa kujawsko-pomorskiego (aleksandrowskim, włocławskim i radziejowskim). Wyniki monitoringu wykazały obecność przędziorka chmielowca na 60% przebadanych plantacji, w tym 26,3% było zaatakowanych w stopniu silnym i bardzo silnym.
EN
Monitoring of the two-spotted spider mite occurrence were conducted on sugar beet crop in southern districts of Kuyavian-Pomeranian Voivodeship. Observations were carried out in 2014, from June to September. A total of 662 plantations were assessed. Monitoring results showed that 60% of sugar beet plantations were settled by two- -spotted spider mite, 26,3 % of them severely.