Fusarium avenaceum as a novel pathogen of spotted knapweed and its phytotoxins, acetamido-butenolide and enniatin B

Joseph Hershenhorn, Sang Ho Park, Andrea Stierle, Gary A. Strobel

Research output: Contribution to journalArticlepeer-review

Abstract

Fusarium avenaceum is described as a novel fungal pathogen of spotted knapweed (Centurea maculosa L.), a noxious range, park and pasture land pest of the Pacific Northwest, USA. Pathogenicity of this fungus was established via Koch's postulates. Two phytotoxins were isolated and characterized from the culture filtrate of this fungus, i.e., acetamido-butenolide and enniatin B. These compounds are not host selective, but do act in a synergistic manner to cause necrotic lesions on detached knapweed leaves. Both phytotoxins, acetamido-butenolide and enniatin B are active at 3.5 × 10-3M and are produced in culture in a ratio of 1:10.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalPlant Science
Volume86
Issue number2
DOIs
StatePublished - 1992

Keywords

  • biological control
  • pathogen
  • phytotoxins
  • plant disease
  • synergism

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