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Biocontrol introduction

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

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

Imported: 1976

Import source: Australia (Ausralian importations were from North America)

Import notes: Imported as Typhlodromus occidentalis

Released: 1976

Release details: Already present in New Zealand before the release of insecticide resisitant strains in 1976. Releases of the resistant strain were made in Nelson, Hawke's Bay, Waimate, Loburn 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.