Threshold Temperatures and Thermal Requirements of Cotton Leafworm, Spodoptera littoralis Hb. | ||
| Egyptian Academic Journal of Biological Sciences. A, Entomology | ||
| Article 12, Volume 14, Issue 3, September 2021, Pages 103-113 PDF (908.33 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/eajbsa.2021.197257 | ||
| Authors | ||
| Eslam A. Y. Allam1; Samer H. Manaa2; Hassan F. Dahi3; Ahmed M. M. Ahmed2; Yones, M. S.4 | ||
| 1Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, Egypt | ||
| 2Plant Protection Department, Faculty of Agriculture, Assiut University, Assiut, Egypt | ||
| 3Plant Protection Research Institute, Agricult. Research Center, Dokki, Giza, Egypt | ||
| 4National authority for remote sensing and space science, cairo, Egypt | ||
| Abstract | ||
| The present investigation aimed to study the effect of four constant temperatures (17, 22, 27 and 32°C) on the developmental rates of different stages of cotton leafworm, Spodoptera littoralis. The incubation period, larval duration, pupal duration, pre-oviposition period and duration of generation were estimated. The time required for development was decreased as the temperature increased. The threshold temperatures were 11.8°C for egg, 7.56 °C for larvae, 12.27 °C for pupae, 12.58°C for the pre-oviposition period, and 10.5 °C for a generation. The average thermal requirements needed for completing the development were 40.1, 283.76, 149.5, 23.96 and 480.6 degree-days for egg, larvae, pupae, pre-oviposition period and generation; respectively. | ||
| Keywords | ||
| Temperatures; leafworm; Spodoptera littoralis. thermal requirements | ||
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