Toxicity and repellency of Eucalyptus globulus L. essential oil against Aphis fabae Scopoli, 1763 (Homoptera: Aphididae)

The present study aimed to examine the effect of Eucalyptus globulus Labill., 1800 essential oil (EGO) against apterous adults of the black bean aphids Aphis fabae in five concentrations (1.25, 2.50, 5, 10 and 15%). The repellent and the insecticide activities were determined using the area preference and the filter paper methods under controlled laboratory conditions. The LC50 and LT50 values were determined by probit analysis. All concentrations were repellent against A. fabae after 2 hours exposure time. 87.5% repellency was seen at highest concentrations of 15%. The kill of all aphids was recorded at the concentration of 15% after 48 hours and at all the concentrations after 72 hours exposure time. The calculated LC50 at 24 hours and LT50 were 1.126 μL cm⁻² and 0.279 days respectively.