The pyrethroids deltamethrin and permethrin, all seem to be
very effective against Ae. albopictus adults, as all populations that
have been tested from a wide geographical area (India, Malaysia,
Thailand, Cameroon, Greece, Italy) over a range of years remain
susceptible to pyrethroids (Table 1). Adults of this species also appear
susceptible to the carbamate propoxur and the organophosphate
malathion. The results of these bioassays possibly reflect
the reduced exposure of the exophilic Ae. albopictus adults to insecticides.
In contrast, evidence of insecticide tolerance in larvae may
be associated with larviciding control campaigns or selection pressure
from agriculture.