Evaluation of certain biogenic compounds and chemical pesticides for controlling bacterial soft rot disease in onion (Allium cepa L.) in Karbala Province

Authors

  • Noor A. A. Al-Gharaby Department of Plant Protection, College of Agriculture, University of Kerbala, Iraq

DOI:

https://doi.org/10.59658/jkas.v12i4.5171

Abstract

Abstract
This study aimed to investigate the occurrence of bacterial soft rot disease in onion crops in Karbala Province, assess its pathogenicity, determine the susceptibility of the most common onion cultivars, and evaluate the effect of selected biogenic agents and chemical pesticides on the pathogen for control purposes. Pathogenicity tests of Pectobacterium carotovorum subsp. carotovorum revealed that isolate Pcc7 was the most virulent, inducing the largest necrotic area (62.62 mm) within 72 hours, followed by isolates Pcc5 and Pcc2, with lesion sizes of 58.22 mm and 40.1 mm, respectively.The evaluation of five onion cultivars for susceptibility to soft rot showed that the Local Red cultivar was significantly more susceptible to P. carotovorum subsp. carotovorum, producing the largest lesion size of 21.2 mm, followed by Texas Early Grano with 9.6 mm.
The results also indicated that both melatonin and glutathione exhibited potent inhibitory effects on P. carotovorum subsp. carotovorum (Pcc7) in vitro, achieving 100% inhibition at a concentration of 1.0 mg/L. In terms of chemical control, three pesticides—Beltanol, Ganger, and Oxyride—demonstrated high efficacy in inhibiting bacterial growth. Both Beltanol and Ganger achieved complete Inhibition (100%) at the highest tested concentration (1.0 mL/L).

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Published

12/25/2025

How to Cite

Noor A. A. Al-Gharaby. (2025). Evaluation of certain biogenic compounds and chemical pesticides for controlling bacterial soft rot disease in onion (Allium cepa L.) in Karbala Province. Journal of Kerbala for Agricultural Sciences, 12(4), 311–320. https://doi.org/10.59658/jkas.v12i4.5171

Issue

Vol. 12 No. 4 (2025): volume 12 number 4 year 2025

Section

Articles

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Copyright (c) 2025 Copyright (c) 2024 is the Author's article. Published by the Journal of Kerbala for Agricultural Sciences under a CC BY 4.0 license

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