Herbicide production companies around the world are searching for new compounds from plants with new modes of action. The objective of this study was to discover Korean native plants with herbicidal activity. After obtaining crude methanol extracts from 63 species of native plants in Korea,
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Fig. 1. (A) Effect of foliar treatment of MeOH extracts on several plants in a greenhouse condition. Plant growth is retarded by the application of MeOH extract. (B) Symptoms of MeOH extracts (4 kg ai ha) on banrnyardgrass () at 7 days after treatment. The several plants (from front left in pot) are banrnyardgrass (), crabgrass (), black grass (Alopecurus myrosuroides), perennial ryegrass (), (from behind left) red morningglory (Quamoclit coccinea), velvetleaf (), pig weed (Amaranthus retroflexus), cocklebur ().