Introducció d'espècies de plantes a les illes Balears a través de les sembres agrícoles

EnglishLots of commercial seeds of five plant species were analysed to get a better understanding of the problem of the presence of seeds of non desirable species. Fifty different species were identified, amongst them standout: Abutilon theophrasti, Amaranthus spp., Datura stramonium and Cichorium endivia ssp. divaricatum. Also identified was Echinaria capitata, a Mediterranean species that has never been cited in the Balearic Islands. The samples that pertained to non-certified seeds showed a notable higher presence of contaminated seeds than those from the certified lots: the former lots had up to 5.8% of undesirable seeds and up to 37 different types of contaminating seeds in a single sample. However, this communication shows that the regulation of contaminated seeds does not eliminate the introduction of new species to the Islands. For this reason, it is recommended that the regulations should be stiffened both quantitatively as well as qualitatively. catalaS'han analitzat mostres de lots de llavors de cinc especies de plantes cultivades per a coneixer el problema de la presencia de llavors d'especies no desitjades. S'han identificat llavors de 50 especies diferents entre les quals destaquen Abutilon theophrasti, Amaranthus spp., Datura stramonium i Cichorium endivia ssp. divaricatum. Tambe s'ha identificat Echinaria capitata, una especie mediterrania pero que no s'ha citat mai a les Illes Balears. Les mostres que pertanyen a lots de llavors no certificats mostren una presencia notablement superior de llavors contaminants que els lots certificats, doncs hem trobat fins a un 5,8% de llavors no desitjades i fins a 37 tipus diferents de llavors contaminants en una sola mostra. Pero aquest treball demostra que la regulacio de certificacio de llavors no elimina el problema de la introduccio de noves especies a les Illes. Per aixo es recomana endurir aquesta regulacio tant quantitativament com qualitativa.