Chemical composition and repellent activity of essential oils from Perilla frutescens (L.) Britt. against sweet potato weevil (Cylas formicarius (F.)) (Coleoptera: brentidae)

Abstract

This study was carried out to evaluate the repellency of P. frutescens essential oils against sweet potato weevil. The chemical composition of Perilla essential oil in Sơn La was determined by the Gas chromatography-mass spectrometry (GC/MS) analysis method, including twenty-four different components exist in the essential oil of P. frutescens. The main components of the essential oil were Perilla aldehyde (47,38%), Limonene (23,46%), Caryophyllene (6,57%), Caryophyllene oxide (3,98%), Linalool (3,45%). The repellent effects of P. frutescens essential oils against the sweet potato weevil were evaluated by using a Y-tube olfactometer system. The results showed that P. frutescens essential oil exhibited high repellency against the sweet potato weevil. P. frutescens essential oil displayed the highest repellency at the concentration of 2 µl (the repellent efficiency was 87,5% for male and 81,0% for female). The results showed the potential of the essential oils for use in the integrated management of the sweet potato weevil.