Fungicidal activity of plant saponin CAY-1 for fungi isolated from diseased Vitis fruit and stems

Anthony J. De Lucca, Maren Klich, Stephen Boue, Thomas E. Cleveland, Tien Sien, Thomas J. Walsh

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Members of 10 fungal genera were isolated from diseased grape berries and stems collected in a local vineyard. These fungi were identified as Alternaria sp., Aspergillus japonicus, Cladosporium cladosporioides, Colletotrichum sp., Curvularia brachyspora, Epicoccum purpurascens, Greeneria uvicola, Nigrospora sphaerica, Trichoderma sp., Penicillium sclerotiorum and P. thomii. CAY-1, a fungicidal saponin in cayenne pepper (Capsicum frutescens) was significantly (p ≤ 0.05) lethal to the germinating (incubated 8 hr) but not the nongerminated (0 hr incubation) conidia of all the fungi except Alternaria and E. purpurascens at concentrations greater than 7.5 μM. CAY-1 was ineffective against the conidia of all the isolated fungi incubated 24 hr prior to mixing with the saponin. Results show that, in vitro, CAY-1 is lethal to these fungi only during their early germination cycle.

Original languageEnglish (US)
Pages (from-to)67-72
Number of pages6
JournalAmerican Journal of Enology and Viticulture
Issue number1
StatePublished - Mar 25 2008


  • Aspergillus
  • CAY-1
  • Fungi
  • Fungicidal
  • Grapes
  • Penicillium
  • Saponin

ASJC Scopus subject areas

  • Food Science
  • Horticulture


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