The Weeds Of Alfalfa As A Source Of Pollen Allergens In The Landscape

The common alfalfa (Medicago sativa) is one of the few cultural plants cultivated on arable land for more than a year. However, together with the crop, weeds are also present on the land, among which highly allergenic plants can be found. Our study deals with data related to the weed infestation of the fodder crop Medicago sativa sampled in Kromeriz District (southeast of the Czech Republic). We found the differences in weed species composition during three years of monitoring, where annual weeds common for annual crops (e.g. Fumaria officinalis, Viola arvensis) continually disappeared at the expense of perennial weeds common mainly in second (e.g. Arctium tomentosum, Rumex acetosa) and third year of monitoring (e.g. Lamium purpureum, Taraxacum sect. Ruderalia). Frequency of anemophilous allergenic plants (e.g. Plantago lanceolata, Rumex acetosa) changed during weed species composition succession.