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To investigate their antiviral potential, extracts from 126 plants grown in the Qinling region of China belonging to 103 plant species of 36 families were evaluated for antiviral activity against Tobacco mosaic virus. The activity of each plant extract on infection and replication was determined by local lesion and leaf-disc methods. Extracts from nine species [ Lactuca tatarica (Linn.) C. A. Mey, Rubus flosculosus Focke, Thermopsis lanceolata R. Br, Cotinus coggygria Scop Pulsatilla chinensis (Bunge) Regel, Thlaspi rvense Linn, Rodgersia podophylla A. Gray, Achnatherum splendens (Trin.) Nevski and Rhodiola eurycarpa (Frod.) S. H. Fu] strongly inhibited both infection and viral replication. [ABSTRACT FROM AUTHOR]