Target pest: Metopolophium dirhodum (Homoptera: Aphididae), rose-grain aphid
Agent introduced: Aphidius rhopalosiphi (Hymenoptera: Braconidae)
Import source: southern England and western France
Released: 1985 to 1987
Release details: Parasitised mummies were released at 20 sites in the South Island - Southland (8,000), Mid-Canterbury (163,000), North Canterbury (7,000), Marlborough (3,000), and at one site in the North Island - Manawatu (5,000).
Establishment: Appears to have established in all release areas and has spread rapidly.
Impacts on target: Estimated to provide benefits of $0.3 - $5 million per annum
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.