Vol. 10, Special Issue 12 (2021)

Author(s):
Chunni Kumari, Jayalaxmi Ganguli, Nivedita Shah and Rashmi Gauraha

Abstract:
Life cycle and morphometric parameters of different stages of C. transversalis was undertaken in the Bio-control Laboratory, Department of Entomology, IGKV, Raipur, Chhattisgarh during the year 2019-20 and 2020-21 on nymphs of cowpea aphid, A. craccivora as host. The average incubation period was3.00±0.775 days, larval mean period of 1^st, 2^nd, 3^rd and 4^thinstar was 1.60±0.490, 2.10±0.300, 1.90±0.831 and 2.50±0.500 days respectively and pupal mean duration was 2.50±0.671 days. The average life cycle duration of male and female beetle was 21.00±1.000 and 35.00±0.975 days. Longevity of male and female beetle was 31- 40 and 44-54 days. The average length and breadth of eggs was 1.22±0.228 and 0.47±0.013 respectively. The average length of 1^st, 2^nd, 3^rd and 4^th instar larvae/ grubs was 1.93±0.058, 4.29±0.282, 5.31±0.252, and 7.30±0.245 respectively. The corresponding breadth of the larvae were 0.85±0.091, 1.55±0.369, 2.13±0.078, and 2.62±0.185 respectively. The length and breadth of male and female beetle were 5.43±0.303, 4.08±0.061 and 6.51±0.156, 5.10±0.168 respectively.