Septoria cirsii, a potential biocontrol agent of Canada thistle and its phytotoxin-ß-nitropropionic acid

Joseph Hershenhorn, Maurizio Vurro, Maria Chiara Zonno, Andrea Stierle, Gary Strobel

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Septoria cirsii causes leaf spot of Canada thistle (Cirsium arvense L.) and no other plat tested was susceptible to this pathogen. Because this pathogen possesses host specificity, and because it is so devastating to Canada thistle plants in the field, it is proposed for consideration as a biological control agenet. In culture, S. cirsii produced copious amounts of a known phytotoxin which was identified as ß-nitropropionic acid. The toxin is inhibitory to seed germination, root elongation and causes the typical symptoms of chlorosis and necrosis on the leaves of Canada thistle which is one of the most toxin-sensitive plants of all of those tested.

Original languageEnglish
Pages (from-to)227-234
Number of pages8
JournalPlant Science
Volume94
Issue number1-2
DOIs
StatePublished - 1993

Keywords

  • Biological control
  • Phytotoxin
  • Plant pathogen
  • Weeds

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