Target pest: Tuberculatus annulatus (Homoptera: Aphididae), oak aphid
Agent introduced: Aphelinus subflavescens (Hymenoptera: Aphelinidae) = Aphelinus flavus (Nees)
Imported: 1939 (was already present in country)
Import source: Europe via Australia
Release details: Unknown
Establishment: Recorded from Christchurch, Nelson and Auckland. Uncertain if the imported A. subflavescens established.
Impacts on target: Unknown
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.