Developmental characteristics of immature stages of Ostrinia scapulalis (Lepidoptera: Crambidae), which is a main insect pest against legume crops, were investigated at constant temperatures to prepare fundamental data for integrated pest management. Egg, larva and pupa could survive at temperatures from 16oC to 36oC. Developmental periods of those stages became shorter with increasing temperature between 16 and 31oC, 16 and 36oC, and 16 and 34oC, respectively. The lower developmental thresholds and degree-days(DD) were determined as 13.0oC and 56.9DD, 13.8oC and 277.5DD, and 14.2oC and 90.8DD using a linear regression model between temperature and development rate. Other parameters for explaining development of this species were estimated using a few non-linear models for developmental rate, distribution, and survivorship.

• Jin Kyo Jung(Crop Cultivation and Environment Division, Natl. Institute of Crop Science, RDA)
• Bo Yoon Seo(Crop Protection Division, Natl. Institute of Agricultural Sciences, RDA)
• Eun Young Kim(Crop Cultivation and Environment Division, Natl. Institute of Crop Science, RDA)
• I Hyeon Kim(Crop Cultivation and Environment Division, Natl. Institute of Crop Science, RDA)