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Effect of bioinsecticides on the grey maize weevil Tanymecus dilaticollis

Author

Listed:
  • Teodora Toshova

    (Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria)

  • Dimitar Velchev

    (Maize Research Institute, Agricultural Academy, Knezha, Bulgaria)

  • Daniela Pilarska

    (Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria
    Department of Natural Sciences, New Bulgarian University, Sofia, Bulgaria)

  • Ivaylo Todorov

    (Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria)

  • Slavimira Draganova

    (Institute of Soil Science, Agrotechnologies and Plant Protection, Agricultural Academy, Sofia, Bulgaria)

  • Jaroslav Holuša

    (Faculty of Forestry and Wood Sciences, Czech University of Life Sciences, Prague, Czech Republic)

  • Danail Takov

    (Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, Sofia, Bulgaria)

Abstract

Tanymecus dilaticollis is an important pest of maize and sunflowers in eastern Europe. In the present study, we examined the effectiveness of two commercially available bioinsecticides against T. dilaticollis adults under laboratory conditions: Naturalis® based on the Beauveria bassiana fungus and an azadirachtin-based botanical product NeemAzal T/S®. Our results suggested that adults of the pests are more susceptible to B. bassiana than to azadirachtin. Naturalis®, tested at six concentrations (2.3 × 102 - 2.3 × 107 conidia/mL), showed a high lethal effect to T. dilaticollis adults, and 100% corrected mortality was observed in the treatments over 2.3 × 105 conidia/mL and 2.3 × 106 conidia/mL for females and males, respectively. NeemAzal T/S®, tested at four concentrations (0.5, 1, 2 and 4%) with two treatments, caused generally low to moderate mortality - 6-44% within 16 days. A field experiment consisted of two sprayings of maize experimental plots with Naturalis® at a rate of 200 mL/0.1 ha and then the recording the number of dead adults of T. dilaticollis in the treated and control plots was conducted in north-western Bulgaria. Twenty days after treatment, a significantly higher mean mortality of the pest caused by the mycoinsecticide than in the control variants was registered.

Suggested Citation

  • Teodora Toshova & Dimitar Velchev & Daniela Pilarska & Ivaylo Todorov & Slavimira Draganova & Jaroslav Holuša & Danail Takov, 2021. "Effect of bioinsecticides on the grey maize weevil Tanymecus dilaticollis," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 57(3), pages 240-247.
    • Handle: RePEc:caa:jnlpps:v:57:y:2021:i:3:id:17-2021-pps
    DOI: 10.17221/17/2021-PPS
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    References listed on IDEAS

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    1. Jolanta KOWALSKA, 2008. "The potential of Beauveria brongniartii and botanical insecticides based on Neem to control Otiorhynchus sulcatus larvae in containerised plants," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 44(1), pages 37-40.
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