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

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Abstract:
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.
Language:
Persian
Published:
Journal of Entomological Society of Iran, Volume:33 Issue: 4, 2014
Pages:
11 to 21
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