Life cycle parameters of the invasive southern green stink bug (Nezara viridula) at laboratory conditions.
The life cycle parameters of Nezara viridula were studied in 2018 under laboratory conditions at the Department of Entomology, Agricultural University of Plovdiv. In the beginning of May field collected adults were placed in Petri dishes for mating and laying eggs (a couple of female and male per dish). A constant temperature of 25 ± 2°C, RH 60- 70% and a photoperiod of 16:8 hours L:D were maintained at the laboratory. The larvae, hatching from 15 egg groups, were reared individually in Petri dishes and monitored daily to determine the duration of each stage. The eggs were laid in groups of 27 to 83. The mean duration of the embryonic development was 6.04 ± 0.71 days. The five nymphal stages last as follows: 3.56 ± 1.56 days for the first instar, 9.75 ± 4.99 days for the 2nd instar, 7.16 ± 3.47 days for the 3rd instar, 10.36 ± 2.98 days for the 4th instar, and 13.46 ± 3.39 days for the 5th instar.