TY - JOUR A1 - Auld, BA A1 - Talbot, HE A1 - Radburn, KB T1 - Resistance of Xanthium occidentale to Colletotrichum orbiculare, a Pathogen of X. spinosum JF - Australian Journal of Botany JO - Aust. J. Bot. Y1 - 1994 VL - 42 IS - 1 SP - 19 EP - 28 KW - UR - https://doi.org/10.1071/BT9940019 N2 - Colletotrichum orbiculare (syn. C. lagenarium), a common pathogen of the weed Xanthium spinosum in eastern Australia, is a potential mycoherbicide for that weed. Related Xanthium spp. are resistant to the fungus, A comparison of experimental infections of X. spinosum and X. occidentale indicated that resistance in leaves of the latter included surface morphology, hypersensitive cell death and formation of lignin-like substances around leaf infections indicated by staining. Infection of stems and fruits occurred in X. occidentale through wounds but lesions continued to grow only on fruits. ER -