| To study effects of temperature on the growth and development of Pieris brassicae reared on Brassica rapa var. glabra Regel, the developmental duration, developmental rate, survival rate and adult longevity of P. brassicae were individually investigated at six different temperatures (16, 20, 22, 25, 28 and 31℃）. The developmental threshold temperatures and effective accumulative temperature were counted by the direct optimization methods. The results showed that within the constant temperature range of 16℃ to 28℃, the development rate of various developmental stages increased with the increase of temperature, whereas the survival rate decreased with the increase of temperature. The developmental threshold temperatures of the egg, larva, pupa, and adult were 11.76℃, 6.87℃, 5.30℃, 14.91℃, respectively, and the effective accumulated temperature were 38.14, 213.90, 169.68, 43.01 d·℃,respectively. Hatching rate, survival rate, pupation rate, pupa weight and emergence rate at 28℃ were significantly lower than the other temperatures. Development of P. brassicae cannot be completed at 31℃. The results indicated that high temperature is not suitable for the survival and growth of P. brassicae. The results were expected to provide a scientific basis for field prediction and integrated management of P. brassicae. |
