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.

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