Water collections in Qalyubiya villages are providing suitable
breeding habitats for mosquitoes including canals, unused wells (sakia
pits), pools, ditches, and drainages. The impact of Aquatain™, a
monomolecular surface film against nature population of mosquito
larvae and pupae was tested in the unused wells in Dajwa village,
Qalyubiya Governorate, Egypt. Monomolecular films are used for
mosquito control because of their suffocating effect on larvae and
pupae. Aquatain™ was applied according to recommended dose in six
unused wells. The results showed that Aquatain had a long-lasting
effect on mosquito population at a dose of 1 ml/m2 and 0.5 ml/m2,
where it caused 100% and 97.9% larval reduction after 3 days posttreatment,
respectively. While, pupal reduction reached 100% after 1
and 3 days post-treatment, respectively. Larval mortality ranged from
85.7% to 41.1% at 0.5 ml/m2 and 93.8% to 66.4% at 1 ml/m2. Pupal
mortality ranged from 98.6% to 65.6% and 100% to 78.3% at 0.5
ml/m2 and 1 ml/m2, respectively. Among the larval instar, 4th larval
instar was more susceptible to Aquatain (93.9%), while 1st larval instar
was less susceptible to Aquatain (29%) at both doses. We noted the
Aquatain™ was more effective at 1 ml/m2 than 0.5 ml/m2 in mosquito
reduction with stability for 15 days post-treatment. The results
indicated that Aquatain provides a sufficient larval and pupal control
in wide mosquito breeding habitats.