Abstract: The effect of environmental factors on the fecundity of fall-migrants and development of sexual females of Schlechtendalia chinensis (Bell) was examined. Using single trials of temperatures ranging from 14℃ to 34℃ and humidities ranging from 100 to 50%RH , the results showed that the fecundity of fallmigrants is essentially related to temperature and humidity, and the most optimum temperature and humidity for reproduction are 26℃ and 80%RH, respectively. Through orthogonal combinations of temperature (X₁), humidity(X₂), and light intensity (X₃) at different levels, the results suggested that temperature is primarily responsible for the development of sexual females, followed by humidity and light intensity. The optimal regression equation between development period (Y) and temperature (X₁), humidity (X₂),light intensity (X₃) was achieved as:Y=26.807-.700X₁+1.825X₂-2.725X₃. Considerably low temperature combined with higher humidity and weaker light intensity caused a decrease in the rate of development of sexual females.

Key words: Pemphigidae, Schlechtendalia chinensis, fecundity, development, environmental factor