Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Distribution and abundance of the species of the genus Avena L. As weeds in winter cereals in the north east of Spain.

Abstract

Surveys were carried out in 1986-89 on winter cereals, mainly barley and wheat, in Aragon and Catalonia to evaluate the extent of wild oat (Avena spp.) infestation. A total of 1444 fields were visited in both dry land and irrigated areas. The different species were, in order of frequency, Avena sterilis subsp. ludoviciana (30.2%), Avena fatua (8.2%) and Avena sterilis subsp. sterilis (2%). These species were observed in 410 000 ha, the infestation being moderate to considerable in 230 000 ha. The subsp. ludoviciana occurred throughout the whole territory whilst the subsp. sterilis preferred the areas nearest the coast and Avena fatua those at a higher altitude.