E. citriodora has not been considered promising from the
insecticidal standpoint in many studies, probably because it
never showed low LC50; however, in this study, the LC50 of
the EO were less than 100 ppm, which indicates that it is
promising. This is clear in several studies such as Amer and
Mehlhorn (2006a), where the larvae of A. aegypti had a
76.7 % mortality at 50 ppm. Basically, the study of Amer
and Mehlhorn had LC similar to those presented herein,
although the E. citriodora used by them was collected in
Germany. On the other hand, E. citriodora from India resulted
in a LC50 of 1.5 % (15,000 ppm) at 60 min. For this specific
case, the difference is not explained by the major compound,
because the species in India and in Colombia have citroneral
(Makhaik et al. 2005). Therefore, there should not be such
large differences between the LCs. In this paper, the insectcidal activity of the compounds was not analyzed separately
from the EO. Unfortunately, many papers do not include a
chemical analysis of the components of the plants evaluated as
insecticides, and this makes it more difficult to understand the
differences shown between studies.