The aqueous fraction of fresh leaves of Cestrum parqui and its organic fractions have been assayed for their phytotoxicity on Lactuca sativa, Lycopersicon esculentum, and Allium cepa . The tests showed that the bioactivity was retained in the organic fractions. Chromatographic processes led to isolation and characterization of the N -( p -carboxymethylphenyl)- p -hydroxybenzamide together with 17 low molecular weight phenols and 2 flavones. The phytotoxicity tests showed a good activity of these compounds on the target species. Comparison of some metabolites with commercial herbicides revealed a major activity of the natural compounds at lower concentrations.
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D’Abrosca et al. (2004) studied this question.