Effect of temperature on life history of Chrysomphalus dictyospermi (Morgan) (Hemiptera diaspididae)

Abstract

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°C±1), constant relative humidity (65±5%) and long photoperiod (16:8 L:D). The intrinsic rate of increase (rm) was 0.03 female/female/day at 22.5°C, 0.05 females/female/day at 25 °C, 0.04 females/female/day at 27.5°C, and 0.06 females/female/day at 30°C. The reproductive rate (Ro) was 22.89, 50.96, 24.79, and 70.58 females/female at 22.5, 25, 27.5, and 30°C, respectively. The generation time (To) was found 102.17, 67.04, 66.21, and 68.48 days at 22.5, 25, 27.5, and 30°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 (T2) was 22.62, 11.82, 14.29, and 11.15 days, and the finite rate of increase (λ) was 1.03, 1.06, 1.04, and 1.06 females/female at 22.5, 25, 27.5, and 30°C, respectively.