| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
This study aimed to develop a method for using dragonflies as biocontrol agents for mosquito control. A field study was conducted to determine whether dragonfly larvae could suppress populations of Ae. albopictus larvae. Specifically, eighth instar larvae of Sympetrum frequens were released into an ovitrap in which they preyed upon mosquitos. Compared to the control treatment, mosquito larvae decreased significantly in ovitraps containing S. frequens and S. infuscatum. The mean number of mosquito larvae remaining in S. frequens and S. infuscatum ovitraps was 1.5±4.6 (mean±SD) and 0.6±1.1, respectively. The results showed that S. frequens and S. infuscatum preyed on 410 to 710 and 339 to 592 mosquito larvae per ovitrap at each site. Suppression effects of S. frequens and S. infuscatum lasted 41±13 and 35±13 days, respectively. The obtained results suggest that S. frequens in ovitraps is effective for regulating larval populations of mosquito vectors.
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