2017 Fiscal Year Final Research Report
Ecological characteristics during growth and dormancy stages in the phytophagous beetle Gastrophysa atrocyanea Mots.
| Project/Area Number |
15K14641
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Crop production science
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| Research Institution | Akita Prefectural University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
阿部 誠 秋田県立大学, 生物資源科学部, 准教授 (70414357)
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Keywords | コガタルリハムシ / ギシギシ類 / 雑草の生物的制御 / 季節消長 / 休眠期 / 成虫保管技術 / 放虫技術 |
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| Outline of Final Research Achievements |
The phytophagous beetle, Gastrophysa atrocyanea Mots, prefers to eat R. obtusifolius L. leaves and stems. Phenological traits of the beetle, such as egg-laying, hatching, larval stage, emergence, and underground movement, were recorded through field observation. Effects of temperature on beetle growth were also investigated under controlled conditions. We found that beetle growth was accelerated under high temperature conditions. Survival rates of dormant adults were investigated under different soil types. Survival rates differed between both soil types and experiment years. We also measured the depth of the soil where the adults spent their dormancy. These results indicate that soil water content may be one of the environmental factors that can affect survival rates. Dormant beetles seemed to be sensitive to dry soil conditions. Increased knowledge about G. atrocyanea Mots would be useful for devising techniques to control R. obtusifolius L. by using this beetle.
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| Free Research Field |
雑草制御学
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