Viability and Developmental Rate of Overwintering Eggs of Trichosirocalus horridus (Coleoptera: Curculionidae)

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Abstract
The developmental rate of eggs of Trichosirocalus horridus (Panzer) in the laboratory was 0.0343 – (0.0071 × temp in °C). Egg hatch threshold was 4.8°C. Successful overwintering of eggs was affected by low temperatures at initial exposure. Eggs survived well when initially exposed to relatively high field temperatures between early November and mid-December, and from late February to March. However, eggs initially subjected to low temperatures between 15 December and 9 February suffered high mortality, although those surviving were not greatly affected by subsequent extended exposure to low temperatures. Most of the eggs initially exposed to field temperatures during this cold period hatched at about the same time. Eggs first exposed in November began hatching outside by mid-March.