Deformation of appendages, antennal segments and sensilla of aphid (Aphis craccivora Koch) treated with Tagetes minuta oil: a scanning electron microscopy study

Abstract

The effect of Tagetes minuta oil on the morphology of Aphis craccivora is reported in the scanning electron microscopy (SEM). Results showed that, flagellar segments of antenna treated with T. minuta showed filamentous and knotted without losing the setae after 96 h of treatment. The sensilla (Type I and II) showed remarkable deformation, reduction in the length and width. Morphometric measurements also helped to identify the deformed sensilla on cuticle and antenna. Type I and antennal sensilla reduced its length by 30% and type II sensilla by 42%. The breadth of type I and II sensilla also reduced by 35%.

Keywords:

• Essential oil
• sucking pest
• ultrastructure
• antennal setae
• trichoid sensilla

Acknowledgements

Authors acknowledge the Director, CSIR-IHBT, Palampur for inspiration and encouragement for the study. IHBT communication number for this article is 4522.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Council of Scientific and Industrial Research, New Delhi, India for funding the project of CSIR – Aroma Mission [HCP-0007].