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Biocontrol introduction

Target pest: Tetranychus urticae (Acari: Tetranychidae), two-spotted spider mite

Agent introduced: Metaseiulus occidentalis (Acarina: Phytoseiidae) = Galendromus occidentalis, Typhlodromus occidentalis

Imported: 1976

Import source: Australia (original stock from North America)

Import notes: Imported as Typhlodromus occidentalis, correct name is now Galendromus 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: Limited success, Largely displaced by Phytoseiulus persimilis


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.