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Biocontrol introduction

Target pest: Cydia pomonella (Lepidoptera: Tortricidae), codling moth

Agent introduced: Ascogaster quadridentata (Hymenoptera: Braconidae)

Imported: 1931, 1942

Import source: Farnham Royal, UK

Released: 1931-32, 1942 consignment not released.

Release details: Cameron et al. (1989) - in 1931-32, 150 were released in Hawkes Bay, 125 in Auckland, 524 in Nelson and 15 in Murchison.

Establishment: Cameron et al. (1989) - established, collected in Nelson during the 1950's. Sandanayaka et al. (2017) - found commonly in Nelson and Central Otago, and in low numbers in Hawke’s Bay, while monitoring for the biocontrol agent Mastrus ridens.

Impacts on target: Cameron et al. (1989) - parasitism levels reach 30% but are variable. Has not reduced pest status of C. pomonella and provides little protection to the fruit.


Cameron PJ, Hill RL, Bain J and 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.

Sandanayaka M, Charles J, Davis V, Chhagan A, Shaw P, Wallis R, Lo P, Cole L, Walker J, Colhoun K. (2017). Establishment of Mastrus ridens (Hymenoptera: Ichneumonidae), an ectoparasitoid of codling moth, in New Zealand. Proceedings of the 5th International Symposium on Biological Control of Arthropods, Langkawi, Malaysia, September 11-15, 2017: 85-87