Laboratory Study to Limitation Degree-Days Which Prerequisite for Stages Development of Waterhyacinth Chevroune weevil Neochetina bruchi (Hustache) Coleoptera: Curculiondeae and the Lowest Developmental Threshold | ||
| Jornal of Biotechnology Research Center | ||
| Article 1, Volume 8, Issue 2, June 2014, Pages 90-94 | ||
| Author | ||
| Ahmed J. M. AL-Shammary | ||
| 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. | ||
| Keywords | ||
| Neochetina bruchi; developmental threshold; Regression equation; thermal units | ||
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