The same effect was observed in reports of the same
continent such as the case of C. sinensis of Brazil with a
LC50 of 538 ppm, at least 26 times higher than ours
(Cavalcanti et al. 2004). In this case, the difference in action
is not explained by place of origin, as both the Brazilian plant
and the Colombian have the same limonene component (Brazil=98 %, Colombia=71.3 %). There may be a synergist
effect in the other components of the EO of Bucaramanga that
boosts the insecticide action. However, Amusan et al. (2005)
showed that the C. sinensis of Nigeria was more effective than
that of Colombia. This result can be attributed to the fact that
in Nigeria, the extract from the peel of the fruit was evaluated,
rather than the EO from the leaves as was the case in this
study. Another explanation of this effect according to Amusan