Seasonal incidence and vertical distribution patterns of oviposition by Aedes aegypti in an urban environment in Trinidad, W. I.

The oviposition patterns of Aedes aegypti were investigated using modified ovitraps placed along 4 vertical transects and monitored weekly for 52 wk in St. Augustine, Trinidad, W.I. From the 832 ovitraps exposed at ground level, 1.2, 3.0 and 4.6-m elevations, 43% (361) were found containing 20,114 Ae. aegypti eggs. During the wet season, 52.7% of the eggs were collected whereas during the dry season only 47.3% were collected. Egg populations were highest at the 1.2-m elevation. The implications of these results are discussed.