A susceptible population (standard) of C. pavonana was obtained from the Physiology and Toxicology Laboratory, Department of Plant Pests and Diseases, Bogor Agricultural University. The insect field populations were obtained from three locations in Pasirwangi district, Garut, which were Karyamekar village, Sirnajaya, and Padasuka. The colony was reared as described by Prijono and Hassan (1992). The larvae were fed with pesticide-free broccoli leaves and the adults were fed with 10% honey solution in a cotton swab.