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New Record for Woldstedtius flavolineatus (Ichneumonidae: Diplazontinae), a Hymenopteran Parasitoid of Syrphid Flies in Hawaii

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Title:New Record for Woldstedtius flavolineatus (Ichneumonidae: Diplazontinae), a Hymenopteran Parasitoid of Syrphid Flies in Hawaii
Authors:Cappadonna, Justin
Euaparadorn, Melody
Peck, Robert W.
Banko, Paul C.
Keywords:Allograpta obliqua
introduced species
new geographic records
show 4 moreseasonal variation
trophic relationships
Woldstedtius flavolineatus
show less
Date Issued:01 Dec 2009
Publisher:Hawaiian Entomological Society
Citation:Cappadonna J, Euaparadorn M, Peck RW, Banko PC. 2009. New record for Woldstedtius flavolineatus (Ichneumonidae: Diplazontinae), a hymenopteran parasitoid of syrphid flies in Hawaii. Proc Hawaiian Entomol Soc 41:105–111.
Abstract:The parasitoid wasp Woldstedtius flavolineatus (Gravenhorst) (Ichneumonidae) attacks the larvae of syrphid flies (Syrphidae). Woldstedtius flavolineatus was
collected in Hawaii for the first time during an extensive malaise trap-based survey of parasitoids in Hawaiian forests. Since its initial collection on Hawaii Island in January 2006, it has been collected at five additional sites on Hawaii Island and at one site each on Maui and Oahu. Malaise trap results from Hakalau Forest National Wildlife Refuge showed a strong seasonal pattern of abundance, with peak population levels reached during July–September. Rearing of its host, Allograpta obliqua (Say), collected from koa (Acacia koa Gray) at Hakalau over two days, revealed a parasitism rate of approximately 95%. Broader impacts of this alien wasp are unknown, but a reduction in host syrphid abundance could result in an increase in numbers of psyllids and aphids (Homoptera) that are preyed upon by syrphid larvae. Furthermore, a reduction in adult syrphids could impact the reproductive success of some of the plants they pollinate.
Pages/Duration:7 pages
Appears in Collections: Volume 41 - December 2009 : Hawaiian Entomological Society

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