The potential nematicidal effects of 18 Chilean plants were evaluated on garlic (Allium sativum) seed cloves infected with Ditylenchus dipsaci. Cloves from infested fields were treated by immersion for 24 hours in plant extracts derived from fresh or air-dried plant parts. The garlic cloves were potted and allowed to grow for 14 weeks under outdoor conditions. At harvest, complete control of the nematode was achieved with fresh extracts from leaves of Plantago major and Ruta graveolens and resulted in the highest quality plants. Extracts of Aristotelia chilensis, Chenopodium ambrosioides, and Ovidia pillopillo reduced (P 0.05) final nematode densities and disease symptoms compared to untreated control plants. None of the other plant extracts showed nematicidal activity against D. dipsaci.
