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Diadromus collaris


(Life: Kingdom: Metazoa (animals); Phylum: Arthropoda; Class: Hexapoda; Order: Hymenoptera;  Superfamily: Ichneumonoidea; Family: Ichneumonidae; Subfamily: Ichneumoninae)

Ischnus collaris Gravenhorst, 1829. Holotype: lost. Type locality?
Diadromus collaris habitus dorsal Diadromus collaris habitus profile
Diadromus collaris head mesosoma dorsal Diadromus collaris propodeum
Diadromus collaris face Diadromus collaris mesosoma profile
Diadromus collaris postpectal carina Diadromus collaris T2
Diadromus collaris wings  


Afrotropical region: South Africa. Cosmopolitan. Widespread in Europe, Middle East to Indo–Australian area, China and Japan. Introduced into numerous countries in the Indo–Australian and West Indies regions and Mexico for biocontrol purposes.


Commonly used as an auxiliary for the biological control of Plutella xylostella (Lepidoptera: Plutellidae) on cultivated cruciferous crops (Brassica spp.). Also reared on Acrolepiopis assectella (Lepidoptera: Plutellidae) and Lobesia botrana (Lepidoptera: Tortricidae). The geographical origin of this species is not clear, as is that of its host Plutella xylostella, which was originally considered to be European. Kfir (1998) based on assessment of the origins of the moth’s host plants and the complex of natural enemies attacking the diamondback moth suggested that the host species is from southern Africa. Diadromus collaris is very common in South Africa where it reproduces sexually (Kfir 1997, 1998) and in Europe it was reported to be thelytokous with mainly females known and hence was speculated to be African (Kfir 1998). However, Liu et al (2001) report that D. collaris is arrhenotokous in Australia, Malaysia, China, Taiwan and France and suggest that the diamondback moth originates in China. Diadromus collaris is probably present throughout the Afrotropical region; however, it is not present in Reunion, where diamondback moth is only a minor pest (Rousse pers. obs.).


Gravenhorst, J.L.C. 1829. Ichneumonologia Europaea. Pars I. Vratislaviae. 827 pp.

Kfir R. 1997. Parasitoids of diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae), in South Africa: an annotated list. Entomophaga 42: 517523.

Kfir R. 1998. Origin of diamondback moth (Lepidoptera: Plutellidae). Annals of the Entomological Society of America 91: 164167.

Liu SS, Wang X-G, Shi Z-H, & Gebremeskel FB. 2001. The biology of Diadromus collaris (Hymenoptera: Ichneumonidae), a pupal parasitoid of Plutella xylostella (Lepidoptera: Plutellidae), and its interactions with Oomyzus sokolowskii (Hymenoptera: Eulophidae). Bulletin of Entomological Research 91: 461–469. doi: 10.1079/BER2001129

Rousse P, van Noort S & Diller E. 2013. Revision of the Afrotropical Phaeogenini (Ichneumonidae, Ichneumoninae), with description of a new genus and twelve new species. Zookeys 354: 1-85. http://dx.doi.org/10.3897/zookeys.354.5968.


Photographs by Pascal Rousse © Iziko Museums of South Africa.

Next genus: Calleupalamus

Web author Simon van Noort (Iziko South African Museum)


Citation: van Noort, S. 2024. WaspWeb: Hymenoptera of the World. URL: www.waspweb.org (accessed on <day/month/year>).

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