Target pest: Eriococcus coriaceous (Homoptera: Eriococcidae), gum tree scale
Agent introduced: Cryptolaemus montrouzieri (Coleoptera: Coccinellidae)
Imported: 1897, 1921-1926
Import source: 1897, 1921-25 Australia, 1923-1926 California, USA (originated from Australia),
Released: 1897, 1921-24
Release details: Released in Whangarei, Auckland and Wellington in 1897. A second shipment was not released and a third was released in Whangarei. Beetles from the third shipment were widely distributed from 1898-1901. Sent to South Canterbury for use against E. coriaceus in 1905. 21 adults and 3 pupae released in Nelson in 1921, 9 adults from USA released in Hastings in 1923. In 1924 around 500 were released in Auckland and Hastings and 450 in Nelson and Blenheim. 42 adults from California were released at Motueka in 1924. In 1924 50 adults were released in Hawkes Bay
Establishment: Considered to be established in Hawkes Bay and Whangarei by 1926. Locally common from Auckland northwards but does not appear to have persisted in cooler areas.
Impacts on target: Has very little effect on E. coriaceus.
Cameron PJ, Hill RL, Bain J and 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.