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<p><i>Pristiphora abietina</i> (Hym.: Tenthredinidae) and <i>Thaumetopoea wilkinsoni</i> (Lep.: Notodontidae) are among the most detrimental forest pests in Türkiye. In this study, a prototype oil-based formulation named Pa4-OD was developed to control both <i>P. abietina</i> and <i>T. wilkinsoni</i>. Under laboratory conditions, the mortality rates for <i>P. abietina</i> and <i>T. wilkinsoni</i> larvae were 95.5% and 98.6%, respectively, 14&#xa0;days after treatment with a&#xa0;spore concentration of 1 × 10<sup>8</sup> spores/mL. The median lethal concentrations (LC<sub>50</sub>) of Pa4-OD were determined to be 2.6 × 10<sup>3</sup> for <i>P. abietina</i> and 7.9 × 10<sup>6</sup> spores/mL for <i>T. wilkinsoni</i>. The formulation was applied against <i>T. wilkinsoni</i> in the field experiment, resulting in 89.9% mortality at 1 × 10<sup>9</sup> blastospores/mL after three weeks (p &lt; 0.05). Furthermore, the mycoinsecticide exhibited minimal adverse effects on <i>Calosoma sycophanta</i> L. (a predator of <i>T. wilkinsoni</i>), <i>Rhizophagus grandis</i> Gyllenhal (a predator of <i>Dendroctonus micans</i> Kugelann is one of the most important pests of spruce forestry) and <i>Thanasimus formicarius</i> L. (another predator for forestry pests). The mortality rate of&#xa0;<i>Apis mellifera caucasica</i> Pollmann adults resulted in 76.6%, with mycosis observed in only 21% of individuals after ten days&#xa0;of exposure to&#xa0;a spore concentration&#xa0;of&#xa0;1 × 10<sup>9</sup> spores/mL.&#xa0;However, few side effects were observed at other doses (1 × 10<sup>5</sup> to 1 × 10<sup>8</sup> spores/mL). This study demonstrated that mycoinsecticide development from the local entomopathogenic fungus <i>B. bassiana</i> could potentially be utilized to control <i>P. abietina</i> and <i>T. wilkinsoni</i> in Türkiye. Pa4-OD provides effective pest control while minimizing harm to beneficial insects, reducing reliance on synthetic insecticides, and supporting environmentally sustainable forest management.</p>

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Target and non-target impact of oil-based Beauveria bassiana formulation in controlling forest insect pests

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年6月24日

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  • Seda Biryol,
  • Nazan Araz Sayın,
  • Rasim Aktürk,
  • Lale Bilgin,
  • Sevda İşık,
  • Ali Soydinç,
  • Elif Fatma Topkara,
  • Oğuzhan Yanar,
  • Savaş Ayvaz,
  • Hülya Turna,
  • Ismail Demir

摘要

Pristiphora abietina (Hym.: Tenthredinidae) and Thaumetopoea wilkinsoni (Lep.: Notodontidae) are among the most detrimental forest pests in Türkiye. In this study, a prototype oil-based formulation named Pa4-OD was developed to control both P. abietina and T. wilkinsoni. Under laboratory conditions, the mortality rates for P. abietina and T. wilkinsoni larvae were 95.5% and 98.6%, respectively, 14 days after treatment with a spore concentration of 1 × 108 spores/mL. The median lethal concentrations (LC50) of Pa4-OD were determined to be 2.6 × 103 for P. abietina and 7.9 × 106 spores/mL for T. wilkinsoni. The formulation was applied against T. wilkinsoni in the field experiment, resulting in 89.9% mortality at 1 × 109 blastospores/mL after three weeks (p < 0.05). Furthermore, the mycoinsecticide exhibited minimal adverse effects on Calosoma sycophanta L. (a predator of T. wilkinsoni), Rhizophagus grandis Gyllenhal (a predator of Dendroctonus micans Kugelann is one of the most important pests of spruce forestry) and Thanasimus formicarius L. (another predator for forestry pests). The mortality rate of Apis mellifera caucasica Pollmann adults resulted in 76.6%, with mycosis observed in only 21% of individuals after ten days of exposure to a spore concentration of 1 × 109 spores/mL. However, few side effects were observed at other doses (1 × 105 to 1 × 108 spores/mL). This study demonstrated that mycoinsecticide development from the local entomopathogenic fungus B. bassiana could potentially be utilized to control P. abietina and T. wilkinsoni in Türkiye. Pa4-OD provides effective pest control while minimizing harm to beneficial insects, reducing reliance on synthetic insecticides, and supporting environmentally sustainable forest management.