Bagrada hilaris (Burmeister), (Hemiptera: Pentatomidae), is native to Africa. It was first reported in the United States in June of 2008 in the county of Los Angeles, California (Arkelian, 2008). Bagrada hilaris is an important polyphagous pest in India. It is a serious pest of Brassicaceae crops. Biology of Bagrada hilaris was studied in detail on mustard crop during the period of Oct. to May 2015. It underwent the hemimetabolous type of development and the studies on biology of B. hilaris indicated that female laid 100 eggs in two to three weeks. Eggs were oval and dirty white. The duration of eggs lasted for an average of 6.0 + 0.79. There were five nymphal instars which completed their development in 17.8 + 3.16 days. The total life cycle from egg laying to adult emergence completed in 19-28 days with an average of 23.8+ 3.49 days. The female lived longer (26.5 + 1.11days) than the male (20.3 + 1.20 days).
