Study for bioinsecticidal activity of tobacco extracts against Helicoverpa armigera Hübner (Lepidoptera: Noctuidae)

Zheko Radev and Liliya Stoyanova
Agricultural Academy, Tobacco and Tobacco Products Institute, 4108 Markovo, Bulgaria

Abstract

Radev, R. & Stoyanova, L. (2024). Study for bioinsecticidal activity of tobacco extracts against Helicoverpa armigera Hübner (Lepidoptera: Noctuidae). Bulg. J. Agric. Sci., 30 (3), 486–490

Bioinsecticidal toxicity of tobacco leaf and seed extracts against 2nd and 3rd larva instar of Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) was studied in laboratory conditions. There was found higher toxicity of tobacco leaf extract against H. armigera 2nd and 3rd larva instar compared to the tobacco seed extract. These differences are probably owing to the nicotine content in the leaves, while it is missing in the seeds. There was found difference in insecticidal toxicity between H. armigera 2nd and 3rd larva instar. The highest effectiveness of tobacco extracts against cotton bollworms were found in 2nd larva instar. When applied concentration of 5% leaf extract there was found 93.3% mortality in 2nd instar and 56.7% mortality in 3rd instar. They were similar results when compared 5% seed extract, 80% mortality in 2nd instar and 43.3% mortality in 3rd instar. No phytotoxicity of tobacco plants was found with both types of extracts. This research showed the possibility for the applying of non-nicotine extracts in the pest control of tobacco plants.

Keywords: tobacco; bioinsecticide; cotton bollworm; Helicoverpa armigera

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