Life cycle of an invasive fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) on sugarcane.
Roving surveys during December 2018 revealed the occurrence of fall army worm (FAW) on sugarcane at Belagavi district in Karnataka. Newly planted sugarcane crop of 30-45 days old in some pockets of Hukkeri taluka having initial damage of 0-5 per cent incidence. As life history of invasive pest is important to know the vulnerable parameters, so life cycle of fall armyworm, Spodoptera frugiperda (J. E. Smith) on sugarcane was studied during December 2018 to January 2019 under laboratory conditions at ARS, Sankeshwar of UAS, Dharwad, Karnataka. Incubation period ranged from 2-3 days with a mean of 2.40 days. Each larvae passed through six distinct instars over a period of 16-22 days. Duration of the pupal period was about 13-14 days. Pre-oviposition, oviposition and post oviposition periods ranged from 4-5, 2-3 and 3-4 days, respectively. In captivity, female layed eggs in groups on sugarcane leaves. The female adult survived for 10.40 days with a range of 9-11 days compared to male which survived for 8.60 days with a range of 7-9 days. The total life cycle of male and female ranged from 38-48 and 40-50 days, respectively. Study of life history of invasive pest as occurring in India is important for identifying the life stages, its spread and also for planning control strategies.