Eggs of Floodwater Mosquitoes. X. Conditioning and Hatching of Winterized Eggs of Aedes sticticus (Diptera: Culicidae)1

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Abstract
Aedes sticticus (Meigen) is a univoltine species that may have 2 or more broods of larvae each spring. The final conditioning of winterized eggs is a result of rising temperature in the spring. Because eggs occur at all horizons on flood plains and particularly along zones of maximum flood, they may be submerged at different times and after different exposures to spring like temperatures. Embryos remain viable after limited exposure to all post-cold temperatures between 8° and 32°C. Higher temperatures shorten the duration of viability. A temperature of 15°C for both conditioning and hatching caused the highest percentage of hatch over any temperature likely to be experienced in the spring. Prolonged exposures (150 days) to 8°C permitted a moderate survival of embryos.

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