| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Outline of Final Research Achievements |
This study was conducted to elucidate the life cycle and control of Trachys yanoi, an important pest of Zelkova serrata. Life cycle, mortality rates in developmental stages, populatin dynamics were investigated. In July, leaves with the final stage of larvae were abscised. New adults emerged from abscised leaves after 9 to 14 days. Because only Zelkova leaves that were abscised in July contained the larvae, the removal of abscised leaves at nine-day intervals over period of early leaf abscission is a simple and effective way to control the beetle. The precipitation during the period when leaf-mining beetles inhabit early abscised leaves regulated the population dynamics of this beetle. This fact may enable us to estimate the damage caused by this beetle.
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