Chagyo Kenkyu Hokoku (Tea Research Journal)
Online ISSN : 1883-941X
Print ISSN : 0366-6190
ISSN-L : 0366-6190
Volume 1973, Issue 40
Displaying 1-10 of 10 articles from this issue
  • Muneyuki NAKAGAWA
    1973 Volume 1973 Issue 40 Pages 1-9
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
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  • Hiroko FUCHINOUE, Isamu YAGI
    1973 Volume 1973 Issue 40 Pages 10-19
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
    1) These several dispositions to renew the tea plants were performed to make clear the process of the change of the yield and its constituent after these dispositions in cold locality.
    2) The light trimming was made on the position, 5-10 cm. under from the plucking surface at the end of May, then the first crop plucking had finished. In a year after the light trimming, we could pluck the first crop and the second crop. And the yield showed about 80-9000 of that of the tea plants not disposed. In three years, it showed 100%.
    3) The light trimming had such a little economic loss that we could enforce it easily for the purpose of the control of height of plant and the renewal of those upper branches in cold locality.
    4) Regarding the rate of the restoration, the pruning is more rapid than the coller pruning. In four years after the renewal, the yield of the pruning showed about 80-90% of that of the tea plants not disposed, and in the case of the coller pruning, it showed about 60%.
    The pruning and the coller pruning takes along time to restore, so these renewals must be enforced intentionally little by little.
    5) About the time of the coller pruning, it is better to enforce at the beginning of March than at the end of May. But the coller pruning at the end of May is convenient, because the first crop-plucking has finished in this season.
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  • Akinori EZUKA, Katsumasa YOSHIDA, Keiichiro USHIJIMA
    1973 Volume 1973 Issue 40 Pages 20-25
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
    1. Tea yellows was first reported by RYU (1952) to be a nutrient deficiency due to root injury caused by ants' attack. But it was much doubtful whether the ants' attack can be the cause of so severe chlorosis as seen in tea yellows. This study was undertaken to determine the real causal agent of tea yellows with special reference to the possibility of its graft transmission. Observations and experiments were conducted buring 1957 and 1958.
    2. Characteristic symptom of tea yellows is yellow to yellowish white irregular splotching of various sizes on leaves (Fig. 1, 2). It is not accompanied by any remarkabled warf, rosette, or malformation. It can easily be distinguished from the variegation due to bud mutation (Fig. 3), mosaic symptom due to nickel excess (Fig. 4) or other unknown origin (Fig. 5), and leaf yellowing due to manganese excess.
    3. Cuttings taken from tea plants affected by yellows were planted on nursery bed prepared from virgin soil. The symptom of yellows sppeared on all the shoots grown from the rooted cuttings.
    No sign of their recovery was observed even after two years' growth. Cuttings taken from healthy plants did not show any symptom on the same nursery bed.
    4. Graft transmission tests were made between affected scions and healthy stocks as well as between healthy scions and affected stocks. In both combinations, typical symptom of tea yellows appeared on newly grown shoots on the healthy side two to four months after the grafting (Table 1). It was noticed that the transmission was obtained even when the grafting was unsuccessful, though it does not necessarily mean the success of juice transmission because of the possibility of partial and temporary union of both tissues before the death of the scions.
    5. The results obtained in this study suggest that tea yellows is due neither to any kind of nutrient deficiency nor to genetic origin, but tit is caused by an infectious agent. Since no microorganism can be detected in affected tissues with optical microscope, the causal agent is presumed to be a virus or a micoplasma-like microorganism. The symptom of tea yellows suggest the probability of being a virus disease.
    6. The occurrence of tea yellows is restricted to a narro warea in Saga Prefecture, Japan. But its symptom is very much similar to that of a virus-induced varegation in Camellia japonica and C. sasanqua reported by PLAKIDAS (1954) and some other investigators. Although the identity between them has not yet been established, it is noticeable that tea yellows is often accompanied by variegated plants of spontaneous C. sasanqua (Fig. 6) in the field. Further studies are needed to identify the causal agent of tea yellows and to demonstrate its trans-mission route under the natural conditions.
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  • Akinori EZUKA, Kyuzo KASAI, Hideo KIBUSHI
    1973 Volume 1973 Issue 40 Pages 26-30
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
    The white root rot of tea in Japan has been supposed to be due to Rosellinia necatrix (HART.) BERL., though the reports were rarely based on the actual observations of its perithecial stage. WATANABE (1963) consequently suggested the possibility that there may be another species of Rosellinia attacking tea or other trees in Japan than R. necatrix.
    In this study, two specimens of white root rot of tea bearing perithecial stage of Roselli nia were examined for the morphological characters. One was found to be just identical with R. ne-catrix described by the previous investigators, while the other specimen from Kanaya, Shizuoka Pref., was somewhat different from R. necatrix in its size and shape of ascospores (Tablel, Fig. 1, and Fig. 2).' The ascospores of the latter species are longer in size and with more slender and attenuate ends than the former, R. necatrix.
    This newly found fungus from Kanaya is similar in its shape of ascospores to R. arcuata PETCH reported to be parasitic on tea in Ceylon by PETCH (1923), though the length of ascospores is not identical. R. arcuata illustrated by BUTLER (1918) rather resembles R. necatrix in its shape of ascospores than the authors' fungus from Kanaya. R. bunodes (B. et BR.) SACC., another species parasitic on tea reported by PETCH (1923), is quite different from the authors' species in its perithecial surface covered with minute warts and also in its longer ascospores with thread-like ends.
    The identification of the authors' fungus from Kanaya is not concluded here because of the lack of direct comparison with the specimens of the related species, especially with R. arcuata. The name "white root rot" of tea is proposed to be applicable to both fungi, R. necatrix and the newly found Rosellinia sp., though the latter still remains unidentified.
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  • Shigeru NAGATOMO
    1973 Volume 1973 Issue 40 Pages 31-36
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
  • Yoshirô MUKASA, Shigeru OGAWA, Kunio KAWARASAKI
    1973 Volume 1973 Issue 40 Pages 37-42
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
  • Sadao HOHARA, Kazuyoshi ISHIGAKI
    1973 Volume 1973 Issue 40 Pages 43-52
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
  • Ichizô ÔNISHI
    1973 Volume 1973 Issue 40 Pages 53-57
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
  • 1973 Volume 1973 Issue 40 Pages 58-66
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
  • Shinsuke SAKAI, Aogu NAKAYAMA, Yoshinori DOI
    1973 Volume 1973 Issue 40 Pages 67-68
    Published: December 26, 1973
    Released on J-STAGE: July 31, 2009
    JOURNAL FREE ACCESS
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