A series of lignans from Bupleurum salicifolium Soland (Umbelliferae) were tesled for nemalostatic activity on the cysts and freed secondstage juveniles of ¡he potalo cyst nematodes Globodera rostochiensis and G. pallida. None of Ihe six lignans lested-bursehemin, rnatairesinol, syringaresinol, Ihe novel produCI buplerol, guayarol. and a derivative, nortrachelogenin triacetale-showed nemalicida...