Target pest: Coleophora frischella (Lepidoptera: Coleophoridae) = Coleophora trifolii, white tipped clover casebearer
Agent introduced: Pteromalus semotus (Hymenoptera: Pteromalidae) = Habrocytus milleri
Near MontmÃ©dy, France
Cameron et al. (1989) - Pteromalus semotus was imported in August 1952 and possibly in August 1955 in Coleophora trifolii host larvae collected near MontmÃ©dy, France. â€˜Considerable numbersâ€™ of P. semotus emerged from the 1952 importation and several hundred adults were released in late-December 1953 (1952?). â€˜Pteromalus semotusâ€™ was also included in the 1955 shipment, but a greater understanding of its biology led to its rejection as a possible biocontrol agent. There was also some question about the identity of the species. Seven females and two males emerged and were sent to the Commonwealth Institute of Entomology for identification after laboratory trials to have them attack New Zealand Coleophora spp. [C. frischella and C. spissicornis] failed. None were released.
Cameron et al. (1989) - several hundred adults were released near Nelson, South Island in late-December 1953 (1952?) [presumably the record states 1953 but possibly in error as 1952 seems more likely for adults emerging from the August 1952 importation] and another 200 at Hastings, North Island.
Cameron et al. (1989) - there have been no recoveries of P. semotus.
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.