Embryo Development and Egg Hatching of Sitona crinitus Herbst (Coleoptera: Curculionidae) under Constant Temperature Regimes


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Mohammed El Damir, Mustapha El Bouhssini, Al-Salty M. N. (31/7/2004). Embryo Development and Egg Hatching of Sitona crinitus Herbst (Coleoptera: Curculionidae) under Constant Temperature Regimes. Pakistan Journal of Biological Sciences, 7 (7), pp. 1191-1193.
The effect of constant temperatures (5, 8, 10, 15, 20, 25, 30 and 35°C) on embryo development period and percentage of egg hatching of S. crinitus Herbst was determined in the laboratory. A significant negative relationship (P < 0.05; r = - 0.84) was found between temperature and embryo development. At temperatures below 35°C there was no significant effect on egg hatching. At 30°C, the embryo development period was the shortest, 7 days; whereas at 8°C this parameter was the longest, 69 days. At 35°C eggs became dry and deformed. Temperatures below 10°C induced quiescence in the egg stage. This information is useful for predicting S. crinitus infestation levels.

Author(s) ORCID(s)

El Bouhssini, Mustapha