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Asteraceae is the second largest angiosperm family after Orchidaceae with ca 1,623 genera, ca 24,700 species1. Many species of Asteraceae are weeds in cultivated fields as well as forest areas. Some of them are aggressive invasive weeds, viz. species of Acanthospermum Schrank, Ageratum L., Ambrosia L., Bidens L., Chromolaena DC., Eupatorium L., Parthenium L., Synedrella Gaertn., Wedelia Jacq., etc. Many of them seriously affect the native or local plant biodiversity, human health and crop productivity.
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