Influence of fungicides and Phytophthora capsici-resistant/tolerant cultivars on bell pepper yield and farm-gate revenues

Jamie R. Stieg, S. Alan Walters, Jason P. Bond, M. Babadoost

Research output: Contribution to journalArticlepeer-review


Phytophthora blight, caused by Phytophthora capsici Leonian, is a widespread and destructive disease of bell pepper (Capsicum annuum L.). Bell pepper yield, farm-gate revenues and Phytophthora blight incidence were determined during 2005 and 2006 in a P. capsici-infested field near Shawneetown, Illinois. The study evaluated 12 bell pepper cultivars (one resistant, three tolerant, and eight susceptible to P. capsici) with or without a recommended fungicide treatment (mefenoxam at transplant and dimethomorph + copper alternated with manganese ethylenebisdithiocarbamate + copper at 10 day intervals). Bell pepper plants receiving fungicide applications showed less Phytophthora blight incidence throughout the growing season and produced greater yield and farm-gate revenues compared to untreated plants. Additionally, P. capsici-resistant 'Paladin' and P. capsici-tolerant 'Alliance', 'Aristotle X3R', and 'Revolution' produced greater yields (≥ 17,800 and 33,800 kg ha -1 for 2005 and 2006, respectively) and farm-gate revenues [≥ $12,700 and $27,000 (USA) ha-1 for 2005 and 2006, respectively] compared to the susceptible cultivars. Therefore, in fields with a high incidence history of Phytophthora blight, 'Paladin' could be a reliable choice for commercial bell pepper production. However, 'Alliance', 'Aristotle X3R', and 'Revolution' may be preferred by growers due to the added benefits of bacterial spot [Xanthomonas campestris pv. vesicatoria (Doidge) Dye] resistance and better fruit quality compared to 'Paladin'. Furthermore, this research indicates that plant resistance and/or tolerance should not be relied upon as the only method of P. capsici control and growers should also incorporate fungicides into their management program to provide additional protection.

Original languageEnglish (US)
Pages (from-to)99-102
Number of pages4
JournalJournal of Applied Horticulture
Issue number2
StatePublished - Jul 2009


  • Capsicum annuum
  • Chemical control
  • Disease management
  • Disease resistance/tolerance
  • Economics
  • Phytophthora blight
  • Phytophthora capsici

ASJC Scopus subject areas

  • Biotechnology
  • Plant Science
  • Horticulture


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