Zone de Texte: There are many desirable alien plants, embellishing parks, gardens, and landscapes. Only very few cause problems, but these problems can be massive „Tens Rule“ 10 % of introduced species spread, 10 % of these establish, and 10 % of the established species cause problems (= 0,1%) ? PRA is important to identify these few species! Zone de Texte: Not all alien plants have to be regulated Zone de Texte: G. Schrader Federal Biological Research Centre for Agriculture and Forestry Zone de Texte: May 2005 Department for Plant Health

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