The turnip sawfly, Athalia rosae is one of the main pests that damage the leaves of cabbage, radish and other cruciferous crops. The developmental biology and morphological characteristics of the immature stages of Athalia rosae were studied in the laboratory using host plant, Chinese cabbage, Brassica rapa var. glabra. A. rosae can be mass reared in laboratory throughout the year under RH 60~70%, 16L:8D and 25±1℃. This species has six larval stages in the female and five larval stages in the male. The developmental period is about 28~29 days. Ovipositional periods and larval developmental periods were 6, 9 days, respectively. The pupal period was about 14 days. Illustrations and descriptions of the various immature stages and their behaviors are provided.

• Hee A Lee(Gyeonggi Agricultural Research and Extension Services)
• Young Su Lee(Gyeonggi Agricultural Research and Extension Services)
• Sun Myoung Park(Gyeonggi Agricultural Research and Extension Services)
• Eun Ju Park(Gyeonggi Agricultural Research and Extension Services)
• Hee Ok Min(Gyeonggi Agricultural Research and Extension Services)
• Gyu Sook Lee(Gyeonggi Agricultural Research and Extension Services)
• Sang Woo Lee(Gyeonggi Agricultural Research and Extension Services)