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Notes: [Proceedings of the National Synthesis Symposium on the Ecology of Biological Invasions held in Stellenbosch, 27 to 29 November, 1985.] Species mentioned in this paper that have been introduced for biological control of weeds include Dactylopius austrinus, D. ceylonicus, D. opuntiae, D. tomentosus, Hypogeococcus festerianus and Eriococcus orariensis.