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Assessment of potential non-target effects of Tetrastichus julis, a biological control agent of the cereal leaf beetle, Oulema melanopus

Vincent A. D. Hervet, Héctor A. Cárcamo, Lloyd M. Dosdall, Terry D. Miller, Swaroop V. Kher
BioControl 2016 v.61 no.4 pp. 399-411
Cassida, Chrysolina quadrigemina, Crioceris duodecimpunctata, Deloyala guttata, Galerucella calmariensis, Gastrophysa, Jonthonota nigripes, Lema, Leptinotarsa decemlineata, Lilioceris lilii, Oulema melanopus, Pyrrhalta luteola, Tetrastichus, biodiversity, biological control, biological control agents, grain crops, indigenous species, introduced species, nontarget organisms, parasitism, parasitoids, risk, summer, Alberta, Washington (state)
The cereal leaf beetle, Oulema melanopus (L.) (Coleoptera: Chrysomelidae), is an emerging pest of cereal crops in the Prairie Provinces of Canada. In other regions with a history of this pest, it is managed primarily through biological control with the parasitoid Tetrastichus julis (Walker) (Hymenoptera: Eulophidae). In this paper we report a study conducted during the summers of 2007 and 2008 in Pullman, Washington (USA), and 2010 and 2012 in Lethbridge, Alberta (Canada) assessing potential non-target effects of T. julis. The chrysomelid species tested included the following native and introduced species of leaf beetles (Chrysomelidae): Cassida azurea Fabricius, Chrysolina quadrigemina (Suffrian), Crioceris duodecimpunctata (L.), Deloyala guttata (Olivier), Galerucella calmariensis (L.), Gastrophysa cyanea Melsheimer, Gastrophysa polygoni L., Jonthonota nigripes (Olivier), Lema daturaphila Kogan & Geode, Leptinotarsa decemlineata (Say), Lilioceris lilii (Scopoli), and Xanthogaleruca luteola (Müller) (Coleoptera: Chrysomelidae). Tetrastichus julis did not parasitize any of these potential non-target species. Thus the occurrence and relocation of T. julis in the Prairie Provinces of Canada and northwestern USA poses a relatively low risk to biodiversity.