Research Article

A Threat to Pepper Production: Regional Dominance of Xanthomonas euvesicatoria in Southeastern Türkiye

Volume: 29 Number: 1 January 1, 2026
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A Threat to Pepper Production: Regional Dominance of Xanthomonas euvesicatoria in Southeastern Türkiye

Abstract

Bacterial spot disease, caused by Xanthomonas spp., significantly impacts pepper production. This study investigated the prevalence and identity of bacterial spot pathogens in Şanlıurfa and Adıyaman, major pepper-producing regions in Southeastern Türkiye. Field surveys conducted from April to October 2020 collected 171 diseased pepper samples from 76 fields, yielding 122 bacterial isolates (108 from Şanlıurfa, 14 from Adıyaman). Pathogenicity tests on pepper seedlings identified 93 isolates (81 from Şanlıurfa, 12 from Adıyaman) as pathogenic. Xanthomonas euvesicatoria UB-35 isolate obtained from Şanlıurfa showed the highest virulence with a scale value of 4 (on a scale of 0-4). Classical identification tests, including Gram reaction, hypersensitive response, and biochemical assays, combined with molecular analysis using species-specific primers, confirmed that all pathogenic isolates were Xanthomonas euvesicatoria. No other Xanthomonas species were detected. These findings highlight the dominance of X. euvesicatoria in the region.

Keywords

Supporting Institution

General Directorate of Agricultural Research and Policies (TAGEM)

Project Number

TAGEM/BSAD/A/22/A2/P1/5395.

Ethical Statement

This study did not involve human participants or animal subjects; therefore, ethical committee approval was not required.

References

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Details

Primary Language

English

Subjects

Phytopathology

Journal Section

Research Article

Early Pub Date

October 18, 2025

Publication Date

January 1, 2026

Submission Date

June 18, 2025

Acceptance Date

August 19, 2025

Published in Issue

Year 2026 Volume: 29 Number: 1

APA
Çaplık, D., & Küsek, M. (2026). A Threat to Pepper Production: Regional Dominance of Xanthomonas euvesicatoria in Southeastern Türkiye. Kahramanmaraş Sütçü İmam Üniversitesi Tarım Ve Doğa Dergisi, 29(1), 195-209. https://doi.org/10.18016/ksutarimdoga.vi.1714952


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