Abstract
Dengue is still being a health problem in Semarang City. Aedes albopictus is a secondary vector but they could be a main vector in an urban area. Sterile Insect technique (SIT) is an alternative tool to control dengue that is more safety than using pesticide. The objective of this study was to develop Aedes albopictus with SIT method to control dengue in Semarang City. Male pupae were irradiated at the doses of 0 (control), 60, 70, and 80 Gy, using 3 replications. The parameters that were measured to determine the quality of males that have been sterilized are number of eggs, sterility level and mating competitiveness. The level of sterility was determined by the percentage of unhatched eggs. Mating competitiveness was determined by Fried index with a ratio of 30 : 10 : 10 (radiated males : fertile males : virgin females). There was no significant difference (p ≤ 0.05) at sterility level to the irradiated males. The results indicated that decreasing irradiated doses conducted increasing in mating competitiveness. However, further trial in field conditions should be undertaken to estimate the release ratio of irradiated males to produce an effect on wild populations.
Highlights
Aedes albopictus is a vector of DHF
The average level of sterility in three times repetition in this research as shown in Table 1 in mating of female and male radiation dose 60 Gy, 70 Gy and 80 Gy with the ratio of 1 : 1 was that the three of them obtained the same value reaching 99%. This result was almost in accordance with the research conducted by Zhang et al, which obtained sterility value of Aedes albopictus mosquito in laboratory and field were 99.5% ad 99.8% in order, but in the lower dose combined with Incompatible Insect Technique (IIT) [11]
According to Helinski et al, the sterile dose on Anopheles mosquitoes could be reached in dose of 100120 Gy, but only produce the sterility level above 98%, means that the sterile dose was not the standard dose, sterile dose could change affected by many factors, one of them is the sexual maturity of mosquito
Summary
Aedes albopictus is a vector of DHF. Even though it is not as important as Aedes aegypty. In laboratory, those two mosquito species could spread dengue virus through the female mosquito to the eggs and its generations, while Aedes albopictus is faster in spreading. Some vector control methods that can be used including the use of chemical compound, biological, mechanical, and environmental management and by using radiation (Sterile Insect Technique) [2]. The success rate of the SIT application in vector control can be seen from the amount of the population decrease after the application. The sterile egg as the product of SIT application is an egg from the insemination of sterile sperm with the embrio of normal female [4].
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