EFFECTS OF LOW AND HIGH TEMPERATURE ON THE EGGS OF Aedes aegypti (L.)( Diptera : Culicidae ) AND THE SUBSEQUENT STAGES DEVELOPED THEREFROM. Sharmin Tarana and Professor Khan Humayun Reza

BJPST: 14(1): 015-019 [Jan, 2016] ISSN: 2305-1809 (Online version)
A study was undertaken to observe the effect of low and high temperatures on the eggs of Ae. aegypti and the different stages developed from there after hatching. The low and high temperatures for the specified periods affected the eggs of Ae. aegypti and the stages developed there from after hatching. The highest number of hatching of the eggs of Ae.aegypti was observed in control (90.67%) at 20°C. There was significant difference in the hatching efficiency of eggs of Ae. aegypti at control, 0.5 hour, 2 hour,  5 hour and 24 hour. There were insignificant differences in the duration of larval periods in treatments and control. Insignificant difference was also observed in the pupal duration in control and treatments. Although there were no significant differences among the treatments, length of the 2nd, 3rd and 4th instars larvae were higher in control than the larvae treated with different temperatures. The length of the pupae in control was higher than the different temperature treatments. Low and high temperatures showed no effect on the body length (mm) of adult male and female. Adults emerged from the eggs treated with different temperatures and exposed for different interval showed that egg laying decreased in low and high temperature than the control.

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