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This study examined phytotoxic activities of several Vietnam localised OM rice (Oryza sativa L. OM) cultivars on junglerice (Echinochloa colona (L.) Link), an invasive weed threatening rice production, and identified allelochemicals and their activities for OM 4498, the most allelopathic cultivar. The aqueous MeOH extracts of all rice cultivars inhibited root and shoot growth of junglerice at a concentration...