Abstract
The results of this study showed that the lowest developmental threshold of eggs, larvae and pupae of N. bruchi was 12, 12 and 11°C respectively at 20,25 and 30°C. While there were no hatching and development of larvae and pupae at 15°C ,While 35°C killed all the stages were tested. The results also 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 killed these stages tested too. The accumulated days degree for the development of egg, larvae and pupae was 143, 500 and 500 thermal units at 20,25 and 30˚C.While it was 333, and 333 thermal units of 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, larvae and pupae at 15°C because there are no developing for these stages.
Highlights
Laboratory Study to Limitation Degree-Days Which Prerequisite for Stages )Development of Waterhyacinth Chevroune weevil Neochetina bruchi
الكهًاث اليفخاحٛت :انغٕعت انًخططت ،عخبت انًُٕ ،يعايهت الاسحذاد ،انٕحذاث انحشاسٚت Abstract The results of this study showed that the lowest developmental threshold of eggs, larvae and pupae of N. bruchi was [12, 12] and 11°C respectively at [20,25] and 30°C
The results 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 killed these stages tested too
Summary
Laboratory Study to Limitation Degree-Days Which Prerequisite for Stages )Development of Waterhyacinth Chevroune weevil Neochetina bruchi ٚوزٌه اٌحبي ثبٌٕغجخ ٌٍٛحذاد اٌحشاس٠خ اٌلاصِخ ٌزطٛس وً دٚس ِٓ ادٚاس٘ب [ ّ٠ٚ ،] 7،8ىٓ حغبة ػزجخ إٌّ ٛاٌذٔ١ب ػٓ غش٠ك [ٚ ]4لذ ػشف []9ػزجخ إٌّ ٛاٌذٔ١ب ٌٍزطٛس ( )Lower threshold temperatureثبٔٙب الً دسعخ حشاس٠خ لا ٠حصً دٙٔٚب ّٔٛ اٌؼظّٚ ٝاٌصغشٚ ٜػزجخ إٌّ ٛاٌذٔ١ب ٌزطٛس اٌحششح ٌٚؼذَ ٚعٛد دساعخ ٌزحذ٠ذ ػزجخ إٌّ ٛاٌذٔ١ب ٚاٌٛحذاد اٌحشاس٠خ اٌلاصِخ ٌزطٛس
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