Life table parameters and development of Aphis nerri (Hem.: Aphididae) at five different temperatures under laboratory conditions

An investigation was carried out to study the life history of Aphis nerri Boyer de Fonscolombe on oleander، Nerium oleander L.، under laboratory conditions (RH of 70 ± 5% and a 16:8 (L: D) h photoperiod) based on the age-stage، two-sex life table at 10، 15، 20، 25 and 30 ºC. Duration of total pre-adult stages was 35. 61 ± 0. 833، 19. 6 ± 0. 343، 12. 02 ± 0. 243، 9. 12 ± 0. 182 and 7. 42 ± 0. 115 days at 10، 15، 20، 25 and 30 ºC، respectively. As temperature increased، the developmental time and longevity of the A. nerri shortened. The shortest developmental time (17. 72 ± 0. 244 days) and longevity (10. 3 ± 0. 234 days) were obtained at 30 ºC. With decreasing temperature، age-stage survivorship (lx) extended. Maximum fecundity of females was observed at 25 ºC with 25. 54 ± 0. 76 nymphs per female. The intrinsic rates of increase (r) at these temperatures were 0. 012 ± 0. 0014، 0. 075 ± 0. 0016، 0. 13 ± 0. 001، 0. 23 ± 0. 003 and 0. 24 ± 0. 003 d-1، respectively. The highest net reproductive rate (R0) was at 25 ºC (25. 56 ± 0. 73) and the lowest value was at 10 ºC (2. 58 ± 0. 28). According to our results، 25-30 ºC were the optimum temperature range for A. nerri population growth.