Strigol (1) was isolated in small amounts from root exudates of cotton (Gossypium hirsutum L.) and identified by Cook and co-w0rkers. l Strigol was found to be a potent seed germination stimulant for striga species and similar parasitic plants in the genus Orobanche. 2 It is presently the most potent seed germination stimulant known for witchweed, which causes considerable economic loss acting upon important crops of the Gramineae family ...