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James A. Litsinger, James W. Apple, Thermal Requirements for Embryonic and Larval Development of the Alfalfa Weevil in Wisconsin, Journal of Economic Entomology, Volume 66, Issue 2, 16 April 1973, Pages 309–311, https://doi.org/10.1093/jee/66.2.309
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Abstract
Embryonie and larval threshold temperatures for development of Hypera postica (Gyllenhal) were 10°C (50°F) and 8.9°C (48°F), respectively. Based on an average of 6 constant temperatures, 176 and 205 thermal units above 50°F were required to 1st and 50% hatch, respectively. Outdoors at Arlington, Wisconsin, 168 and 189 thermal units elapsed to 1st and 50% hatch. Averages of 70.6, 140.6, 207.0, and 297.9 thermal units accumulated outdoors above base 48°F for 50% development from eclosion through the 1st to 4th stadia (to prepupa), respectively.