%0 Journal Article %A Auld, BA %A Talbot, HE %A Radburn, KB %T Resistance of Xanthium occidentale to Colletotrichum orbiculare, a Pathogen of X. spinosum %J Australian Journal of Botany %D 1994/02/01 %V 42 %N 1 %P 19-28 %K %R https://doi.org/10.1071/BT9940019 %U https://www.publish.csiro.au/paper/BT9940019 %X 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.