FIELD OVERWINTER SURVIVORSHIP OF AEDES-ALBOPICTUS EGGS IN JAPAN

The overwintering ability of eggs of 3 temperate and 2 tropical strain s of Aedes albopictus was assessed at 5 field sites during winter 1991 -92 and 4 field sites during winter 1992-93 in Japan. Nagasaki, the wa rmest site, is the only site at which tropical Ae. albopictus could po ssibly become established. The eggs of temperate Ae. albopictus can su rvive less than half of the winters in Sapporo. Temperate Ae. albopict us can survive at least some of the winters at Bijo Daira, Kitakami, N agasaki, Tokyo, and Toyama.