Mosquito Oviposition in Bamboo Traps, with Special Reference to Aedes Albopictus, Aedes Novalbopictus and Armigeres Subalbatus
Seven species of mosquitoes oviposited in open and bored bamboo traps at a site in Peradeniya, Sri Lanka, the most prevalent being Aedes albopictus, Aedes novalbopictus and Armigeres subalbatus. These three species preferred to lay in open than in bored traps. Aedes albopictus and Ar. subalbatus preferred to lay at ground level but Ae. novalbopictus showed no preference between ground level, 3.5 and 7.0 m height. A comparison of two collection series, one with traps in fixed positions and the other with traps interchanged randomly with respect to the positions, showed that individual trap attractiveness is a factor that can have a marked influence on the overall oviposition trends in Ae. albopictus and Ar. subalbatus.
A study of oviposition with respect to height above the water level showed that in Ae. albopictus and Ar. subalbatus, more than 75% of the eggs were laid within about 16 mm of the waterline. However, there was a markedly greater dispersion of eggs in Ae. albopictus, indicating more vertical movement during oviposition in this species than in Ar. subalbatus.
Key WordsMosquito oviposition bamboo traps vertical stratification oviposition water level Aedes albopictus Aedes novalbopictus Armigeres subalbatus Sri Lanka
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