In order to understand the herbicidal activities of different organs of Coreopsis grandiflora Hogg.and provide the evidence for further study of active compounds,the studies were conducted using seedlings of Lactuca sativa L.,Amaranthus retroflexus L.,Abutilon theophrasti Medicus Malv.,Triticum aestivum L.and Echinochloa crusgalli(L.)Beauv.as the receiver plants by the method of grinded Coreopsis grandiflora Hogg.tissue powder mixed with agar(PPA)in the laboratory.The growth of different receiver plants see...