Development of Platynota flavedana and P. idaeusalis (Lepidoptera: Tortricidae) at constant temperatures in the laboratory

Development of Platynota flavedana Clemens and P. idaeusalis (Walker) on a meridic diet was observed at constant temperatures in the laboratory. Lower developmental threshold values for egg, larval, and pupal stages of P. flavedana were 10.6, 8.6, and 9.0 degree C, respectively. Lower developmental threshold values of 9.7, 7.0, and 8.5 degree C were estimated for egg, larval, and pupal stages of P. idaeusalis , respectively. Averages of 101.5 DD sub(10.6), 379.6 DD sub(8.6), and 126.0 DD sub(9.0) were required for development of egg, larval, and pupal stages of P. flavedana , respectively. P. idaeusalis required 104.7 DD sub(9.7), 442.7 DD sub(7.0), and 132.2 DD sub(8.5) to complete development in the egg, larval, and pupal stages, respectively.