Efficacy of nonionic surfactants in the control of zoospore spread of Pythium aphanidermatum in a recirculating hydroponic system

M. E. Stanghellini, S. L. Rasmussen, D. H. Kim, P. A. Rorabaugh

Research output: Contribution to journalArticle

57 Scopus citations

Abstract

Zoosporic fungi are among the most destructive root pathogens in recirculating hydroponic cultural systems, and zoospores have been implicated as the primary, if not sole, infectious propagule responsible for the spread of these pathogens via the recirculating nutrient solution. In vivo experiments employing cucumbers as the susceptible host and Pythium aphanidermatum as the root pathogen demonstrated the efficacy of surfactants in the control of root disease caused by this fungus. Amending the recirculating nutrient solution with a nonionic surfactant (final concentration, 20 μg a.i./ml) resulted in complete control of the spread of the fungus via the recirculating nutrient solution. Zoospores were identified as the sole propagule responsible for pathogen dissemination in the recirculating nutrient solution. In the absence of a surfactant, all plants within a recirculating hydroponic unit were killed within 5 to 6 weeks following hypocotyl inoculation of a single plant in the hydroponic unit.

Original languageEnglish (US)
Pages (from-to)422-428
Number of pages7
JournalPlant disease
Volume80
Issue number4
DOIs
StatePublished - Apr 1996

Keywords

  • Lettuce
  • Peppers
  • Phytophthora capsici
  • Plasmopara lactucae-radicis

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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