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Background <p>Citrus black spot (CBS), even recently reported in Tunisia, could be responsible for considerable losses in lemon growing areas. The present study evaluated different <i>Trichoderma</i> species against <i>Phyllosticta citricarpa</i> causative agent of CBS using two assays.</p> Results <p>The obtained in vitro results exhibited the efficacy of these antagonists to reduce <i>P. citricarpa</i> mycelial growth and the inhibition rate values varied. <i>Trichoderma</i> species showed the highest mycelial growth inhibition with 54.33%, noted for <i>P. citricarpa</i> isolate CBS1 treated with <i>Trichoderma atroviride</i> (A3), and 51.76 and 53.51% for <i>P. citricarpa</i> isolate CBS4 confronted with <i>T. atroviride</i> and <i>Trichoderma asperellum</i>, respectively. The in vivo assay on Citrus lemon fruits confirmed the decrease of the lesions development caused by four <i>P. citricarpa</i> isolates<i>.</i> In fact, the decrease varied from 28.28 to 72.83% for the <i>P. citricarpa</i> CBS3 isolate treated with <i>Trichoderma kunmingense</i> and <i>Trichoderma atroviride</i>, respectively.</p> Conclusions <p>Based on the current results, the used <i>Trichoderma</i> species reduced <i>P. citricarpa</i> mycelial growth in vitro and the lesions appearance due to <i>P. citricarpa</i> on <i>Citrus limon</i> variety Eureka. The efficacy varied upon on the antagonist species and pathogen isolates. Thus, they showed a promising potential to be used to control CBS.</p>

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Antifungal effect of three Trichoderma species against the citrus black spot caused by Phyllosticta citricarpa in Tunisia

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月11日

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  • Sabrine Mannai,
  • Ibtissem Ben Salem,
  • Afef Farhati,
  • Naima Boughalleb-M’Hamdi

摘要

Background

Citrus black spot (CBS), even recently reported in Tunisia, could be responsible for considerable losses in lemon growing areas. The present study evaluated different Trichoderma species against Phyllosticta citricarpa causative agent of CBS using two assays.

Results

The obtained in vitro results exhibited the efficacy of these antagonists to reduce P. citricarpa mycelial growth and the inhibition rate values varied. Trichoderma species showed the highest mycelial growth inhibition with 54.33%, noted for P. citricarpa isolate CBS1 treated with Trichoderma atroviride (A3), and 51.76 and 53.51% for P. citricarpa isolate CBS4 confronted with T. atroviride and Trichoderma asperellum, respectively. The in vivo assay on Citrus lemon fruits confirmed the decrease of the lesions development caused by four P. citricarpa isolates. In fact, the decrease varied from 28.28 to 72.83% for the P. citricarpa CBS3 isolate treated with Trichoderma kunmingense and Trichoderma atroviride, respectively.

Conclusions

Based on the current results, the used Trichoderma species reduced P. citricarpa mycelial growth in vitro and the lesions appearance due to P. citricarpa on Citrus limon variety Eureka. The efficacy varied upon on the antagonist species and pathogen isolates. Thus, they showed a promising potential to be used to control CBS.