Study on the Survival and Reprodactive Performance of Sterile Male Glossina Pallidipes (Diptera: Glossinidae) At Kality Tsetse Fly Rearing and Irradiation Center, Addis Ababa.
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Date
2010-06
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Addis Ababa University
Abstract
Laboratorical investigation were conducted to know the effect of irradiation (sterility) on
reproductive performance of females G. pallidipes mated with sterile and fertile males
under temperature of 23-25 oC and 75-80% relative humidity. Completely randomized
designs with three replications were followed throughout the experiments.
The irradiation effects on male G. pallidipes at different doses of irradiation were checked
using, 60Gy, 80Gy, 100Gy and 120Gy. Results showed that at highest doses the sterility
effects on male Glossina pallidipes were significantly lower than lowest doses (P< 0.05) on
pupae production and emergence of adults. On the other hand, the highest dose (120Gy)
caused abortion of egg/larvae significantly higher than the lower dose (60Gy) (P< 0.05). In
other investigation which was aimed to assessing the competitiveness of sterile males to
fertile males in a cage at ratios of 9 sterile: 1 fertile males, 7 sterile to 3 fertile males, 5
sterile to 5 fertile males and 3 sterile to 7 fertile males, the results showed that the ratio with
the highest number of sterile (9: 1) in the cage caused significantly low number of pupae
and number of adults emerged from pupae than those with lower number of sterile males (3:
7) (P< 0.05). Similarly, the ratio with the highest sterile males (9: 1) resulted in significantly
higher number of egg/larvae abortion than those with lower number of sterile males (3: 7)
ratio (P< 0.05). In the present study, survival of male G. pallidipes irradiated with 120Gy
three days after emergence from pupae was significantly higher than males irradiated one
and ten days after emergence from pupae (P< 0.05). This may indicate that irradiated males
may need to rest up to 7 or 10 days before released to the field. The importance of
sterilization using appropriate dose, the appropriate ratio of sterile to fertile males and the
time at which sterility was done efficiently all are relevant.
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Biology