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Resistance of Canada Thistle (Cirsium arvense) Ecotypes to a Rust Pathogen (Puccinia obtegens)

Published online by Cambridge University Press:  12 June 2017

Sherry K. Turner ,
Peter K. Fay ,
Eugene L. Sharp  and
David C. Sands
Sherry K. Turner
Affiliation:
Agric. Exp. Stn., Montana State Univ., Bozeman 59717
Peter K. Fay
Affiliation:
Agric. Exp. Stn., Montana State Univ., Bozeman 59717
Eugene L. Sharp
Affiliation:
Agric. Exp. Stn., Montana State Univ., Bozeman 59717
David C. Sands
Affiliation:
Agric. Exp. Stn., Montana State Univ., Bozeman 59717
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Abstract

Puccinia obtegens (Link) Tul., an autoecious rust pathogen, is a potential biological control agent of Canada thistle [Cirsium arvense (L.) Scop.]. Ten ecotypes of Canada thistle were inoculated with uredospores of P. obtegens and sporulation was observed on all ecotypes. Infection types varied among and within ecotypes, indicating that host-resistance is one factor limiting rust infection. No correlation was found between Canada thistle susceptibility to the rust and host plant ecotype classification, stomatal density, amount of leaf pubescence, or spore germinability on leaf surfaces.

Keywords

Endemic pathogenbiological weed control
Type
Research Article
Information
Weed Science , Volume 29 , Issue 6 , November 1981 , pp. 623 - 624
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

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