Target pest: Agrotis ipsilon (Lepidoptera: Noctuidae), greasy cutworm
Agent introduced: Macrocentrus collaris (Hymenoptera: Braconidae)
Cameron et al. (1989) - Macrocentrus collaris was imported from Pakistan in 1971 as part of a programme to introduce A. ipsilon parasitoids into New Zealand and was reared and released in large numbers.
Cameron et al. (1989) - large numbers were released 1971-72 [actual numbers and locations are not reported].
Cameron et al. (1989) - several surveys since the release of M. collaris have failed to recover this parasitoid.
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.