AUTHOR(S)
Rohit Kumar1, Vijay Kumar 2 and Priyanka Bhatt 3*
ABSTRACT
Insecticidal activities of four essential plant oils Artemisia vulgaris (Burn), Cymbopogon flexuosus
(Steud), Tagetes minuta (Khakibush) and Rosmarinus officinalis (Linneaus) were evaluated against
Aphis gossypii by using leaf dip and residue contact bioassay techniques respectively. Artemisia
vulgaris oil was found to be most toxic in residue contact as compared to leaf dip bioassay. The
LC50 of A. vulgaris was 0.118% and 0.179% at 24 hours after exposure (HAE) in residue contact
and leaf dip bioassay methods respectively. The order of toxicity at 48 HAE was as follows A.
vulgaris (0.104%) > C. flexuosus (0.169%) > T. minuta (0.272%) and R. officinalis (0.319%) in
residue contact bioassay. In leaf dip bioassay, the order of toxicity was A. vulgaris (0.161%) > C.
flexuosus (0.182%) > T. minuta (0.358%) and R. officinalis (0.481%). Relative toxicity of A.
vulgaris, C. flexuosus and T. minuta was found to be 3.07, 1.97 and 1.17 respectively in residue
contact method and 2.97, 2.64 and 1.34 respectively in leaf dip method. The lower values of LC50
of all the four essential oils was observed in residue contact method which indicates it’s superiority
over leaf dip bioassay. [Keywords: Essential oils, LC50, LT50, Bioassay, Toxicity, Artemesia vulgaris
DOI
https://doi.org/10.57182/jbiopestic.17.1.08-14
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How to cite this article:
Rohit Kumar, Vijay Kumar, and Priyanka Bhatt. 2024. Residual toxicities of some plant
essential oils against Cotton Aphid, Aphis gossypii Glover. Journal of Biopesticides, 17(1): 08-14.