Target pest: Plutella xylostella (Lepidoptera: Yponomeutidae), diamondback moth
Agent introduced: Diadromus subtilicornis (Hymenoptera: Ichneumonidae)
Cameron et al. (1989) - Diadromus subtilicornis was imported from Canada. There were two consignments in the 1940-41 season, the first (in late-November 1940) of 33 adults, over half of which arrived dead. Details of the second consignment were not found. Three later consignments in 1941 totalled 4,090 parasitoid cocoons. Laboratory cultures were not established from any of the importations, and no releases made.
Cameron et al. (1989) - not released.
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.