Target pest: Panonychus ulmi (Acari: Tetranychidae), European red mite
Agent introduced: Metaseiulus occidentalis (Acarina: Phytoseiidae) = Galendromus occidentalis, Typhlodromus occidentalis
Import source: Australia (Australian importations were from North America)
Import notes: Imported as Typhlodromus occidentalis, the correct name is now Gallendromus occidentalis
Release details: Present in New Zealand prior to an insecticide resistant strain being introduced in 1976. Resistant strain was released in Nelson, Hastings, Waimate, Central Otago and Lincoln.
Establishment: Resistant strain established in Central Otago, Canterbury and Nelson (Hope).
Impacts on target: Contributes little to the control of P. ulmi.
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.