author(s)
Arunkumara CG, Bheemanna M, Shaila HM, Raju Teggelli and Sreedevi Chavan

abstract
The biology of spotted stem borer Chilo partellus (Swinhoe) was studied on artificial diet under laboratory conditions during Kharif 2016 at College of Agriculture Raichur, revealed that the pre-oviposition and oviposition period ranged from 1.0 to 1.5 and 3 to 5 days. Incubation period ranged from 3.5 to 7 days with an average of 5.15 ± 1.13 days. Larva passed through six instars and total larval period ranged from 24.5 to 47.5 days. The duration of each instar from first to six was 4.55 ± 0.64, 4.50 ± 1.33, 5.25 ± 1.37, 5.75 ± 1.65, 6.20 ± 1.13 and 7.75 ± 1.27 days respectively. The pupal period of the stem borer range from 6 to 11.05 days. The life cycle of the Chilo partellus occupied 34 to 66 days with an average of 48.1 ± 10.71 days. The longevity of the female moth varied from 4.5 to 7.0 days and male it was 3.0 to 6.0 days. The fecundity rate ranged from 184 to 456 with an average of 329.6 ± 96.26.