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    Author(s): Andre Gassmann; Rosemarie De Clerck-Floate; Sharlene Sing; Ivo Tosevski; Milana Mitrovic; Olivier Krstic
    Date: 2014
    Source: BioControl. 59: 473-483.
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (445.73 KB)


    Linaria vulgaris Mill. (Plantaginaceae), common or yellow toadflax, is a Eurasian short-lived perennial forb invasive throughout temperate North America. Rhinusa pilosa (Gyllenhal) (Coleoptera, Curculionidae) is a univoltine shoot-galling weevil found exclusively on L. vulgaris in Europe. Under no-choice test conditions, 13 non-native Linaria species exposed toR. pilosawere accepted for oviposition andmostwere found to be suitable, to varying degrees, for gall and larval development. Adult feeding and survival was minimal on native North American species in the plant tribeAntirrhineaewhich includes the target plant. In nochoice tests with 63 native North American species and 24 other non-target species outside Linaria, oviposition was limited to four nativeNorthAmerican species.Only three larvae developed to the adult stage on Sairocarpus virga (A.Gray)D.A. Sutton,with no negative impact on plant growth. Risks to native flora fromthe release of R. pilosa are therefore expected to be minimal. The Technical Advisory Group for the Biological Control of Weeds (TAG-BCW) has recommended release of R. pilosa in September 2013.

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    Gassmann, Andre; De Clerck-Floate, Rosemarie; Sing, Sharlene; Tosevski, Ivo; Mitrovic, Milana; Krstic, Olivier. 2014. Biology and host specificity of Rhinusa pilosa, a recommended biological control agent of Linaria vulgaris. BioControl. 59: 473-483.


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    common toadflax, yellow toadflax, Curculionidae, host range tests, pre-release studies, biological control of weeds

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