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<p>Potato common scab, caused by <i>Streptomyces</i> species, reduces tuber quality and market value. In Egypt, disease incidence ranges from 22.5% to 60%, yet effective eco-friendly management strategies remain underexplored. This study aimed to isolate and characterize pathogenic <i>Streptomyces</i> strains from El-Beheira Governorate and evaluate the biocontrol potential of green tea (<i>Camellia sinensis</i>) and apple peel (<i>Malus domestica</i>) extracts. Eighteen <i>Streptomyces</i> isolates were obtained, with eight showing pathogenicity in potato slice and radish seedling assays. Molecular analysis revealed that 44.4% carried <i>txtAB</i> (thaxtomin biosynthesis) and <i>tomA</i> genes, while 16.7% harbored <i>nec1</i>. Species-specific PCR confirmed <i>S. scabiei</i> as the predominant pathogen (50%). Green tea extract (GTE) showed stronger antimicrobial activity (24&#xa0;mm inhibition zone at 100&#xa0;mg/mL) than apple peel extract (APE; 17&#xa0;mm), correlating with higher polyphenolic content (145.6 vs. 38.4&#xa0;mg GAE/g). A synergistic effect was observed with a 1:2 APE: GTE combination, reducing potato lesions by 67% and enhancing radish root growth by 53%. The extracts also suppressed thaxtomin A production, with the combination achieving 70–75% reduction. These findings highlight the potential of flavonoid-rich plant extracts as sustainable biocontrol agents for managing PCS in Egypt, offering a promising alternative to chemical treatments.</p>

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Biocontrol of Streptomyces scabiei-induced potato common scab using flavonoid-rich plant extracts: pathogen characterization and sustainable management in Egypt

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Doaa A. Komeil,
  • Fayza H. Gomaa

摘要

Potato common scab, caused by Streptomyces species, reduces tuber quality and market value. In Egypt, disease incidence ranges from 22.5% to 60%, yet effective eco-friendly management strategies remain underexplored. This study aimed to isolate and characterize pathogenic Streptomyces strains from El-Beheira Governorate and evaluate the biocontrol potential of green tea (Camellia sinensis) and apple peel (Malus domestica) extracts. Eighteen Streptomyces isolates were obtained, with eight showing pathogenicity in potato slice and radish seedling assays. Molecular analysis revealed that 44.4% carried txtAB (thaxtomin biosynthesis) and tomA genes, while 16.7% harbored nec1. Species-specific PCR confirmed S. scabiei as the predominant pathogen (50%). Green tea extract (GTE) showed stronger antimicrobial activity (24 mm inhibition zone at 100 mg/mL) than apple peel extract (APE; 17 mm), correlating with higher polyphenolic content (145.6 vs. 38.4 mg GAE/g). A synergistic effect was observed with a 1:2 APE: GTE combination, reducing potato lesions by 67% and enhancing radish root growth by 53%. The extracts also suppressed thaxtomin A production, with the combination achieving 70–75% reduction. These findings highlight the potential of flavonoid-rich plant extracts as sustainable biocontrol agents for managing PCS in Egypt, offering a promising alternative to chemical treatments.