On a Needle Rust of <i>Pinus strobus</i> LINN. Caused by <i>Coleosporium eupatorii</i> ARTHUR

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  • <i>Coleosporium eupatorii</i> ARTHURによるストローブマツの葉さび病
  • Coleosporium eupatorii ARTHURによるストローブマツの葉さび病 さび胞子,夏胞子の感染距離および本病の発生源
  • Coleosporium eupatorii ARTHUR ニ ヨル ストローブマツ ノ ハサビ ビョウ サビ ホウシ , ナツホウシ ノ カンセン キョリ オヨビ ホンビョウ ノ ハッセイ ゲン
  • さび胞子,夏胞子の感染距離および本病の発生源
  • Effective Range of Aecidio- and Uredio-spores Infection and an Original Host of the Fungus at Mt. Fuji

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The writers observed that young plantations of Pinus strobus LINN. weree damaged by a needle rust disease on Mt. Fuji and in its vicinity from 1961 to 1964.<br> 1) As shown in Table 2, from the results of inoculation experiments with the aecidiospores collected on the affected needles of P. strobus, it is clear that the causal fungus is Coleosporium eupatorii ARTHUR.<br> 2) In the plantations shown in Fig. 3, effective range of aecidio-and uredio-spores. infection was measured during 1962_??_1964. Results of these tests are summarized in Table 4 and Fig. 4. In late June when the aecidiospores were dispersing abundantly, the range of infection was limited within small areas. In late July, however, the effective range of infection caused by urediospores extended to a distance of about 100_??_500 meters. from the primary infection source and in mid-September the disease occurred all over the investigated areas. However, it was observed that the intensity of infection was heavier within and around the P. strobus plantation and the occurrence was more intense in the leeward parts than the windward parts of the investigated area.<br> 3) The needle rust fungus was collected also on native trees of Pinus pentaphylla MAYR. Considering the fact that this fungus was found on this native five-needle pine. distributing on Mt. Fuji, it seems probable that the pine species, P. pentaphylla is an original host and a source of infection to P. strobus plantations on Mt. Fuji and in its. vicinity.

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