| Budget Amount *help |
¥41,730,000 (Direct Cost: ¥32,100,000、Indirect Cost: ¥9,630,000)
Fiscal Year 2019: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2018: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
Fiscal Year 2017: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
Fiscal Year 2016: ¥12,740,000 (Direct Cost: ¥9,800,000、Indirect Cost: ¥2,940,000)
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| Outline of Final Research Achievements |
Raffaelea quercivora is a pathogen of the Japanese oak wilt (JOW). We sampled R. querqivora from Indonesia and inoculated to healthy trees of eight species native to Indonesia. Compared to Japanese species, areas of necrosis were small suggesting that difference in tree resistance is one of causes that the JOW occurs only in Japan. Preference of bark and ambrosia beetles to wood freshness and log size were determined, which are likely factors influencing risks of wilt diseases. Amplicon analysis to determine fungal flora in mycangium of ambrosia beetles revealed great seasonal difference in proportion of the primary ambrosia fungus. The influence of the plant phylogeny tended to be stronger with latitude. Mitochondrial DNA sequence was determined for about 80 species of bark beetles.
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