Experiment was carried out to standardize the artificial diet for mass rearing of Helicoverpa armigera (Hiibner) under laboratory conditions. The average length and breadth of egg was 0.51±0.06 mm, 0.46±0.37 mm and 0.52±0.03 mm, 0.48±0.62 on artificial and natural diet. The average length and breadth offirst, second, third, fourth and fifth instar larvae was 1.40±0.09 mm, 0.46±0.02 mm and 1.42+-.0.01 mm, 0.47±0.16 mm and 4.03±0.22 mm, 0.66±0.07 mm and 4.31±0.01 mm, 0.89±0.25 mm and 8.19+-.0.36 mm, 1.57±0.63 mm, and 10.29±0.72 mm, 1.87+-.0.91 mm and 18.70±0.44 mm, 2.78±0.040 mm and20.15±0.03 mm, 3.17±0.55 mm and 26.01+-0.19 mm, 4.09±0.39 mm and 27.32±0.027 mm, 5.88±0.69 mm, respectively with the average duration of2.69±0.32 and2.54±0.29, 3.77±0.65 and3.79±0.11, 3.88±0.49 and3.72±1.23, 5.35±0.55 and 5.72±0.91 and 6.61±0.008, 6.46±1.07 days, respectively on artificial as well as on natural diet. The average length and breadth of adult male and female was 18.01+-0.48 mm and 35.09±1.25 mm, 18.51±1.04 mm and38.11+-1.37 mm, 19.00+-0.18 mm and 19.10+-0.49 mm, 37.75±1.27 mm and41.23±1.69 mm, respectively. The average pre-oviposition, oviposition andpost-oviposition period was 2.52±0.86 and 2.76±0.84 days, 4.93±0.78 and5.08±0.90 days and 0.65±0.49 and 0.79±0.93 days, respectively. The total life cycle of male and female was 40.50+-2.29 and 41.81±1.89 days and 42.59±1.77 and 43.80+-1.93 days.
展开▼
