Hybrid of Rumex patientia x Rumex tianschanicus (Rumex OK-2) as a potentially new invasive weed in Central Europe

摘要

Since 2001 a hybrid of docks Rumex patientia x Rumex tianschanicus (Rumex OK-2) has been grown as a new energy crop in the Czech Republic. It was originally bred as a forage crop plant in Ukraine and then introduced for the same reason to the Czech Republic. In the past five years a successive spreading in the surroundings of the fields of the original plantation was observed. This paper evaluates the results of the two monitoring years (2011 and 2012) at the eastern edge of Prague where Rumex OK-2 was established on arable land. In 2011 each plant of the Rumex OK-2 was located by geodetic GPS equipment in the study area. In 2012, the presence of Rumex OK-2 plants was verified and some newly discovered plants were recorded. By comparison of the twosuccessive years, we have shown successive spreading of Rumex OK-2, mainly in man-made habitats. It seems that Rumex OK-2 could have an invasive potential. Further detailed study of its biology and ecology is needed.