n African Entomology - Temperature effects on development and survival of the sweetpotato weevil, Boheman (Coleoptera : Apionidae)




The effects of temperature on the development and survival of the sweetpotato weevil, were studied in the laboratory at six constant temperatures (16.03, 18.60, 24.11, 26.38, 31.23 and 35.82 °C). The photoperiod was maintained at 12L : 12D for all temperatures, but RH was not controlled. Thermal requirements ( and ) of this pest species were estimated for all the immature stages and for the total life-cycle. Duration of development from hatching to pupation was observed for individuals disturbed at regular intervals to determine instar-specific development rate. This was compared with total development duration for sets of individuals not disturbed in this way. As expected, development rate was slower at lower temperatures. At 16.03 °C there was no development beyond the first larval instar. The larval period was longer than other stages at all temperatures. A significant difference in total development rate of adults was observed between the two treatments (disturbed and undisturbed), except at 18.60 °C. Mortalities were highest at 16.03, 18.60 and 35.82 °C. Temperature had no effect on the sex ratio of .


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