Bulgarian Journal of Agricultural Science
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Test of bio-insecticidal activity of tobacco extracts against Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae)
Zheko Radev, Liliya Stoyanova
Abstract: In the present study under laboratory conditions, the bio insecticidal activity of tobacco leaf and seed extracts against larvae of Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae) were tested. Higher toxicity was recorded of the tobacco leaf extract compared to the tobacco seed extract. This is most likely due to the nicotine content in the leaves, while it’s absent in the seeds. The highest mortality of Colorado beetle larvae 90.5% was reported for the tobacco leaf extract at concentration of 5%. Tobacco seed extract showed 46.7% efficacy at 5% concentration, and this efficacy was similar at 3% concentration of tobacco leaf extract. Differences were found between efficacy of the different concentrations of the extracts. Phytotoxicity of eggplants Solanum melongena L. was not reported during experimental treatments at a concentration of 5 % with both extracts. This study demonstrated the potential for the use of non-nicotine extracts in the control of plant pests of S. melongena of Solanaceae family.
Keywords: bioinsecticide; colorado beetle; Leptinotarsa decemlineata; tobacco
Citation: Radev, Zh. & Stoyanova, L. (2023). Test of bio-insecticidal activity of tobacco extracts against Leptinotarsa decemlineata Say (Coleoptera: Chrysomelidae). Bulg. J. Agric. Sci., 29(6), 1075–1078.
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Date published: 2023-12-15
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