シラカンバにおける形成層潜孔虫ミノドヒラタモグリガによるピスフレックの発生部位 [in Japanese] Distribution of pith flecks caused by the cambium miner, Opostegoides minodensis, in Japanese white birch [in Japanese]
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Opostegoides minodensis ( Lepidoptera Opostegidae) is one of the cambium miners of Japanese white birch, Betula platyphylla var. japonica, and the mines appear as brown streaks in the wood, called pith flecks. The distribution of the pith flecks in stems of the trees was investigated in Hokkaido in 1988. The pith flecks occurred from the base to near the top of stem. The number of pith flecks increased downward in the upper 6m of stems and/or in upper stems that were less than 3 to 5cm in radius. In the lower parts and/or in thicker stems, the number fluctuated independently of the height or stem thickness, and they averaged about ten in the unit of pith flecks caused by one larva per cross section. However, in half of the sample trees, the number decreased in the basal 0.75m of stems. The pith flecks occurred at 0.2 to 7.2cm distance from the pith, and in the lower parts of stems over 5cm in radius, they were most abundant at 0.5 to 2cm from the pith.
- Journal of the Japanese Forestry Society
Journal of the Japanese Forestry Society 72(6), 508-512, 1990-11-01
Japanese Forestry Society