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Biocontrol introduction

Target pest: Icerya purchasi (Hemiptera: Monophlebidae), cottony cushion scale

Agent introduced: Rodolia cardinalis (Coleoptera: Coccinellidae)

Imported: Self introduced before 1888, c1891, 1894, 1922, 1926

Import source: 1891 Australia via California, 1894 Australia, 1922 and 1926 NSW Australia

Released: 1891, 1894, 1922, 1926

Release details: Released in 1891 at Nelson and Whangarei. It is not known if or where the 1894 importation was released. In 1922 (29 lrvae and 2 pupae) and in 1926 (81 larvae, 11 pupae and 9 adults) were released in Nelson. It was distributed widely around New Zealand from 1895

Establishment: Recovered from Auckland, Hawke's Bay, Wanganui and Nelson

Impacts on target: Considered in conjunction with Cryptochetum iceryae to provide control of I. purchasi. R cardinalis is the major controlling agent.


Cameron PJ, Hill RL, Bain J, Thomas WP (1989). A Review of Biological Control of Invertebrate Pests and Weeds in New Zealand 1874-1987. Technical Communication No 10. CAB International Institute of Biological Control. DSIR Entomology Division. 424p.

Tillyard RJ (1923). History of the introduction of beneficial insects into New Zealand. Proceedings of the Pan-Pacific Science Congress, Australia, 383-390.