Biocontrol introduction
Target pest: Costelytra zealandica (Coleoptera: Scarabaeidae), grass grub
Agent introduced: Pterostichus unistriatus (Coleoptera: Carabidae) = Trirammatus unistratus
Imported: 1968-72
Import source: Argentina
Release details: 587 released in Nelson
Establishment: Not recovered
References
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.