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.
M. El Damir, M. El Bouhssini and M.N. Al-Salty , 2004. Embryo Development and Egg Hatching of Sitona crinitus Herbst (Coleoptera:
Curculionidae) under Constant Temperature Regimes. Pakistan Journal of Biological Sciences, 7: 1191-1193.