Pyrrhalta luteola(Müller) was reared at five constant temperatures from 15.6 to 36.1°C. The optimum temperatures for egg and larval survival were 22.2 and 28.8°C, respectively. Eggs did not hatch at 36.1°; larvae also exhibited high mortality at this temperature. Pupae survived at all temperatures tested with minimal mortality. The developmental rate of allP. luteolastages increased with rise in temperature. Embryonic, larval, and pupal developmental threshold temperatures were estimated at 11.3, 11.0, and 11.1°C, respectively. Mean degree-day (°C) accumulations required for completion of life stages were: 78.9 for egg, 268.1 for larva, and 89.3 for pupa. Accumulated degree-days>11.1°C during outdoor development ofP. luteoladid not differ significantly from those calculated from laboratory data.