author(s)
Kanwar Kumar, Maha Singh Jaglan and Tarun Verma

abstract
Biological studies of early shoot borer, Chilo infuscatellus Snellen (Crambidae; Lepidoptera) were conducted during March, 2017 to July, 2017 in laboratories of CCS Haryana Agricultural University, Regional Research Station, Karnal on sugarcane genotype CoH 119. Results on biology of C. infuscatellus revealed that freshly laid eggs were creamish white which are initially transparent and later turn to yellowish in colour with pin head size spot and chorion was colourless and transparent. Incubation period varied from 3 to 5 days. The larvae of C. infuscatellus moulted four times and passed through five instars. Total larval duration of C. infuscatellus ranged from 18 to 26 days with an average of 22.31±1.16 days. The pupal duration of C. infuscatellus female ranged from 4 to 6 days and duration of male pupae varied from 4 to 5 days. The genital aperture was situated on the ventral side of eighth abdominal segment in the form of slit in female pupae whereas, in male pupae, the genital aperture was situated on the raised oval sclerite with linear depression in the middle of ninth abdominal segment. Female pupae were slightly bigger in size as compared to that of male pupae. Longevity of female moths varied from 3 to 5 days with an average of 4.07 days whereas longevity of male moths ranged from 3 to 4 days with an average of 3.24 days. The total life span of Chilo infuscatellus ranged from 29 to 44 days for female and 29 to 42 days for male.