Research Information System
REDIA-GIORNALE DI ZOOLOGIA, vol.99, pp.145-149, 2016 (SCI-Expanded)
This study documented the life table parameters of Chrysomphalus dictyospermi (Morgan) (Hemiptera: Diaspididae) reared on pumpkins at three different constant temperatures (22.5, 25, 27.5, and 30 degrees C +/- 1), constant relative humidity (65 +/- 5%) and long photoperiod (16:8 L:D).The intrinsic rate of increase (r(m)) was 0.03 femaleJfemale/day at 22.5 degrees C, 0.05 females/female/day at 25 degrees C, 0.04 females/female/day at 27.5 degrees C, and 0.06 females/female/day at 30 degrees C. The reproductive rate (R-o) was 22.89, 50.96, 24.79, and 70.58 females/female at 22.5, 25, 27.5, and 30 degrees C, respectively. The generation time (T-o) was found 102.17, 67,04, 66.21, and 68.48 days at 22.5, 25, 27.5, and 30 degrees C, respectively. In addition the gross reproduction rate (GRR) was calculated as 32.76, 66.96, 33.07, and 88.60 females/female, the doubling time (T-2) was 22.62, 11.82, 14.29, and 11.15 days, and the finite rate of increase (lambda) was 1.03, 1.06, 1.04, and 1.06 females/female at 22.5, 25, 27.5, and 30 degrees C, respectively.