Abstract— Common ragweed (Ambrosia artemisiifolia) is an invasive alien species indigenous to North America. Ragweed is a big threat to agriculture and has a serious impact on human health. One of the most important areas with ragweed occurrence within Europe is Pannonian Plain in Central Europe. This research introduces for the first time the unique, direct broad-scale survey of A. artemisiifolia in relation to real-life occurrence and infestation in the field. To understand the distribution of ragweed in the territory the geospatial analysis was applied to create 2D map in ArcGIS environment. The field survey was undertaken during summer 2015 in the Žitný ostrov (Slovakia) and Szigetköz (Hungary). Importance of ragweed survey in these two landscapes is not only because the agricultural significance, but is enhanced by the effect of its pollen on human health. The investigation revealed that spatial occurrence of A. artemisiifolia is not homogeneous and there is also striking territorial heterogeneity of infestation rate. In Žitný ostrov ragweed was observed at 143 (54,78%) out of 261 sites. In Szigetköz ragweed was observed at 50 (54,94%) out from 91 sites. This study offers inventory of ragweed frequency over the large area.
Keywords— real-life occurrence, spatial distribution, territorial heterogeneity, associated plant communities
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