Toxicity and repellent effect of essential oils and a major component against Lipaphis erysimi

	Toxicity and repellent effect of essential oils and a major component against Lipaphis erysimi
Journal of Crop Protection
Article 2, Volume 6, Issue 1, 2017, Pages 15-23 PDF (319.6 K)
DOI: 10.48311/jcp.2017.1321
Authors
Vinod Kumar^* ; Chandra Shekhar Mathela
Department of Chemistry, Kumaun University, Nainital 263002, Uttarakhand, India.
Abstract
Essential oils (EOs) extracted from aerial parts of Aster indamellus Grierson, Calamintha umbrosa Benth. and Erigeron annuus (L.) Pres.were analyzed by GC, GC/MS. The major acetylenic constituent (cis-lachnophyllum ester) of E. annuus was isolated and characterized by ¹H and ¹³C-NMR spectra. Their toxicity and repellent effect against Lipaphiserysimi was tested. Oils of E. annuus and C. umbrosa exhibited higher toxicity on direct spray and by fumigation. LC₅₀ value of E. annuus oil was 0.43 mg/ml as direct spray. By fumigation, LC₅₀ value for E. annuus was 1.29 ml/l air, while for C. umbrosa;it was 1.00 ml/l air. With acetylenic ester, about half of L. erysimi were killed at 10 mg/ml approximately within 13.25 h, while with E. annuus oil the LT₅₀ value was approximately 8.89 h. In conclusion, the EO of E. annuus and its acetylenic constituent have potential as biopesticide for economically important crop pests.
Keywords
Essential oil; cis-lachnophyllum ester; Lipaphis erysimi; toxicity; repellence
References

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