دراﺳﺔ ﻣﺨﺘﺒﺮﯾﮫ ﻟﺘﺤﺪﯾﺪ اﻟﻮﺣﺪات اﻟﺤﺮارﯾﺔ اﻟﻼزﻣﺔ ﻟﺘﻄﻮر اﻻدوار اﻟﻤﺨﺘﻠﻔﺔ ﻟﺴﻮﺳﺔ زھﺮة اﻟﻨﯿﻞ اﻟﻤﺨﻄﻄﺔ Neochetina bruchi (Hustache) (Coleoptera : Curculiondeae) وﻋﺘﺒﺔ اﻟﻨﻤﻮ اﻟﺪﻧﯿﺎ ﻟﻜﻞ دور

The results of this studyshowedthat the lowest developmental threshold of eggs, larvaeand pupae of N. bruchi was 12, 12 and 11°C respectivelyat 20,25 and 30°C. While there wereno hatching and development oflarvaeand pupae at 15°C ,While 35°C killedallthestagesweretested.The resultsalso showed that the lowest developmental threshold of male and female was 15 and 14°C respectively at 15,20,25 and 30°C While 35°C killedthese stages tested too. The accumulated days degree for the development of egg, larvaeand pupae was 143,500 and 500 thermal units at 20,25 and 30 ̊C.While it was 333, and 333 thermal unitsof male and female respectively at 15,20,25 and 30°C. So there are no accumulated days degree for the development of egg, larvae, pupae, male and female at 35°C because it was killer for these stages. While there are no accumulated days degree for the development of egg, larvaeand pupae at 15°C because there are no developingfor these stages.