HERBICIDAL COMPOUNDS FROM ACROPTILON REPENS

摘要

The present invention provides herbicidal compositions based on exudates ofthe invasive Acroptilon repens (Russian knapweed) plant. An active componentfromthe exudate is 7,8-benzoflavone (a-naphthoflavone) and the isomer 5,6-benzoflavone(.beta.-naphthoflavone) as well as flavone are shown to have useful phytotoxicactivity.Methods of isolating the 7,8-benzoflavone from the exudate and methods ofusingflavone-containing herbicidal compositions are also provided.