Campbell, M.H., Holtkamp, R.H., McCormick, L.H., Wykes, P.J., Donaldson, J.F., Gullan, P.J., & Gillespie, P.S. 1994 Biological control of the native shrubs Cassinia spp. using the native scale insects Austrotachardia sp. and Paratachardina sp. (Hemiptera: Kerriidae) in New South Wales.. Plant Protection Quarterly 9: 64-68.

Notes: A complex of parasitoids and predators, mainly small wasps, may limit the effectiveness of these scales in controlling Cassinia spp.; suggestion for technique to solve this problem.