Efficacy of Pecan Husk and Shell Phenolic Extracts Against Phytophthora Blight in Chile Pepper

Phillip Lujan, Srijana Dura, Ivette Guzman, Mary Grace, Mary A. Lila, Robert Steiner, Soum Sanogo

Research output: Contribution to journalArticlepeer-review


Phytophthora blight, caused by Phytophthora capsici, is detrimental to chile peppers (Capsicum sp.). In this study, phenolics extracted from pecan (Carya illinoinensis) husk and shell were foliarly applied to chile pepper (Capsicum annuum L., cultivar NM 6-4) to induce a resistance response against plant infection by P. capsici. Several pecan metabolite extractions were tested, and an acetic acid (2%) in aqueous methanol (80%) solution was the best extraction solvent, yielding total polyphenolic content of 290 mg/g dry weight from husk and 641 mg/g from shell. The phenolic extracts from husk and shell were applied as foliar sprays at different concentrations to chile plants inoculated with a virulent isolate of P. capsici. Chile plants treated with 1% phenolic husk or shell extracts or 0.1% salicylic acid remained alive throughout the study, whereas plants subjected to all other treatments (including a water control treatment) died. Analyses of the extracts through spectrophotometry and high-performance liquid chromatography indicated that the phenolic content in the extracts was largely made up of pro-anthocyanidins also known as condensed tannins. Pecan byproducts may be used as additional options for management of Phytophthora blight.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalPlant Health Progress
Issue number3
StatePublished - 2021


  • Capsicum annuum
  • Phytophthora capsici
  • elicitors
  • induced resistance
  • proanthocyanidins
  • soilborne pathogens

ASJC Scopus subject areas

  • Plant Science
  • Horticulture


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