Proceedings of the 9th Australian Weeds Conference 493-496. Campbell, M. H., Nielsen, W. J., and Nicol, H. I. 1991. Cavers, P. B., Groves, R. H., and Kaye, P. E. 1995. Seed population dynamics of Onopordum over 1 year in southern New South Wales. Davidson, S. 1990.
Goats help eliminate thistles.
Dellow, J. J., Woodburn-TL, Briese DT, and Corey, S. 1996. Herbicide techniques for thistle management. Forcella, F. and Wood, J. T. 1984. Forcella, F. and Wood, H. 1986. Fromm, G. M. 1990.