Establishment and dispersal of the introduced parasite Aphidius eadyi (Hymenoptera: Aphidiidae) in the North Island of New Zealand, and its initial effect on pea aphid

Abstract Aphidius eadyi Stary, Gonzales, & Hall, an introduced parasite of Acyrthosiphon pisum, was recovered in the Helensville area in December 1977. It overwintered successfully, and in I year dispersed 120 km northward to Ruakaka and a similar distance southward to Hamilton. Parasitism was recorded in the field from September to May. The parasite was well synchronised with pea aphid populations, and parasitism rates frequently reached populations when the non-host species Acyrthosiphon kondoi was the dominant aphid. Comparison of areas with and without parasites, in space and time, indicated that A. eadyi had reduced pea aphid populations, possibly because of its ability to respond to increasing pea aphid densities.

[1]  R. Dickson,et al.  Geographical distribution ofAphidiidae [Hym.] imported to California for biological control ofAcyrthosiphon kondoi andAcyrthosiphon pisum [Hom.: Aphididae] , 1978, Entomophaga.

[2]  P. Starý,et al.  Aphidius eadyi n.sp. (Hymenoptera: Aphidiidae), a widely distributed parasitoid of the pea aphid, Acyrthosiphon pisum (Harris) in the Palearctic. , 1980 .

[3]  D. Gaynor,et al.  Observations on Acyrthosiphon kondoi and A. pisum on lucerne crops in the southern North Island, New Zealand (Hemiptera: Aphididae). , 1980 .

[4]  R. Hill,et al.  Introduction of lucerne aphid parasites and a preliminary evaluation of the natural enemies of Acyrthosiphon spp. (Hemiptera: Aphididae) in New Zealand. , 1980 .

[5]  M. Oliver,et al.  Pest assessment studies of blue-green lucerne and pea aphids in the southern North Island of New Zealand , 1979 .

[6]  R. Archibald,et al.  New records of plant pests in New Zealand: III. Six species of Homoptera , 1979 .

[7]  G. Hosking.  Trap comparison in the capture of flying Coleoptera , 1979 .

[8]  R. Archibald.  Some observations on the hosts and distribution of pea aphid, Acyrthosiphon pisum (Homoptera: Aphididae), during its establishment in New Zealand. , 1979 .

[9]  O. Mochida,et al.  Possible Migration of Aphid Parasites(Hymenoptera : Aphidiidae)Across the East China Sea , 1978 .

[10]  M. Oliver,et al.  Blue-green lucerne aphid damage in lucerne crops within Southern North Island , 1977 .

[11]  R. Fuester,et al.  The Aphidius Parasites of the Pea Aphid Acyrthosiphon pisum in the Eastern Half of the United States , 1977 .

[12]  P. Starý,et al.  A PRELIMINARY REVIEW OF THE APHIDIIDAE (HYMENOPTERA: ICHNEUMONOIDEA) OF AUSTRALIA AND NEW ZEALAND , 1974 .

[13]  M. Mackauer,et al.  Some climatic effects on the spread and abundance of two parasites of the pea aphid in British Columbia (Hymenoptera: Aphidiidae - Homoptera: Aphididae) , 1973 .

[14]  G. Varley,et al.  Population models for the winter moth. , 1968 .

[15]  D. W. Clancy.  Discovery of the Pea Aphid Parasite Aphidius smithi, in Central Mexico , 1967 .

[16]  K. Hagen,et al.  Imported Indian Parasite of Pea Aphid established in California , 1960 .