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<p>In southern Tunisia, <i>Tetranychus urticae</i> Koch (Acari: Tetranychidae) and <i>Aculops lycopersici</i> Massee (Acari: Eriophyidae) are among the most destructive mites. They cause severe damage in heated greenhouses when the infestations are undetected in the early stage. This study evaluated the pathogenicity of the entomopathogenic fungus (EPF) <i>Beauveria bassiana</i> against these two mite species under controlled laboratory conditions (27 ± 1&#xa0;°C, 65 ± 5% RH, and a photoperiod of 16:8 (L: D) h) to search for sustainable alternatives of conventional chemical control methods. The results showed that five days after treatment, <i>B. bassiana</i> PPRI at a concentration of 10<sup>8</sup> conidia/mL achieved corrected mortality of up to 86% for eggs and 100% for <i>T. urticae</i> females. The lethal concentrations (LC50) were 7.05 × 10⁵ and 4.65 × 10⁴ conidia/mL for eggs and females, respectively. In addition, <i>B. bassiana</i> PPRI and <i>Lecanicillium muscarium</i> Ve6 reduced the population of <i>A. lycopersici</i> compared to untreated controls. <i>Beauveria bassiana</i> achieved a 99.14 to 100% reduction in eggs and over 98% reduction in mobile forms within 15 days, while <i>L. muscarium</i> resulted in a 76.53 to 88.67% reduction in eggs and a 77.96 to 87.48% reduction in mobile forms. These results demonstrate the potential of EPFs as effective and sustainable biocontrol agents against <i>T. urticae</i> and <i>A. lycopersici</i> in greenhouse crops.</p> Graphical abstract <p></p>

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Assessment of the Beauveria Bassiana PPRI strain for the biological control of Tetranychus urticae Koch (Acari: Tetranychidae) and Aculops lycopersici Massee (Acari: Eriophyidae)

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Sabrine Chouikhi,
  • Besma Hamrouni Assadi,
  • Habiba Gnidez Glida,
  • Kamel Nagaz,
  • Kaouthar Grissa Lebdi,
  • Mohamed Sadok Belkadhi

摘要

In southern Tunisia, Tetranychus urticae Koch (Acari: Tetranychidae) and Aculops lycopersici Massee (Acari: Eriophyidae) are among the most destructive mites. They cause severe damage in heated greenhouses when the infestations are undetected in the early stage. This study evaluated the pathogenicity of the entomopathogenic fungus (EPF) Beauveria bassiana against these two mite species under controlled laboratory conditions (27 ± 1 °C, 65 ± 5% RH, and a photoperiod of 16:8 (L: D) h) to search for sustainable alternatives of conventional chemical control methods. The results showed that five days after treatment, B. bassiana PPRI at a concentration of 108 conidia/mL achieved corrected mortality of up to 86% for eggs and 100% for T. urticae females. The lethal concentrations (LC50) were 7.05 × 10⁵ and 4.65 × 10⁴ conidia/mL for eggs and females, respectively. In addition, B. bassiana PPRI and Lecanicillium muscarium Ve6 reduced the population of A. lycopersici compared to untreated controls. Beauveria bassiana achieved a 99.14 to 100% reduction in eggs and over 98% reduction in mobile forms within 15 days, while L. muscarium resulted in a 76.53 to 88.67% reduction in eggs and a 77.96 to 87.48% reduction in mobile forms. These results demonstrate the potential of EPFs as effective and sustainable biocontrol agents against T. urticae and A. lycopersici in greenhouse crops.

Graphical abstract