Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
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Volume 73, Issue 3
Displaying 1-11 of 11 articles from this issue
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Presidential Address
Lectures by the Winners of the Society Fellowship
Originals
  • The effect of mancozeb wp (wettable powder) on mancozeb adhesion and melanose control after application on wet citrus trees.
    T. MIYOSHI, Y. KAWAHATA, S. SHIMIZU
    2007 Volume 73 Issue 3 Pages 149-154
    Published: 2007
    Released on J-STAGE: September 06, 2007
    DOIhttps://doi.org/10.3186/jjphytopath.73.149
    JOURNAL FREE ACCESS
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    Mancozeb wp was sprayed on wet citrus trees to examine the effect on mancozeb adhesion and melanose control. In the first trial, mancozeb wp was sprayed on wet fruits, and the amount of mancozeb adhesion was analyzed as methyl derivative by HPLC method. The amount of mancozeb adhesion on wet fruits was 7.2 μg/cm2, approximately half of that on control (dry) ones. In the next trial, mancozeb wp was sprayed on citrus trees immediately after trees were sprayed with 10 liters of water per tree, and the amount of mancozeb adhesion on leaves and the control of melanose on fruits were examined one month after the application. Artificial inoculation was made by spraying 106 conidia/ml water of Diaporthe citri on fruits picked up from treated trees. Mancozeb adhesion on leaves of the wet and dry citrus trees were 0.6 and 1.2 μg/cm2 while their disease severity (0-100 scale) were 16.1 and 7.4, respectively. Similar results were also obtained in field tests in 2001 and 2003.
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  • Detection of benomyl-resistant Glomerella cingulata from latently infected strawberry plants and infested nursery medium using a semiselective medium.
    K. OKAYAMA, Y. HIRAYAMA, M. NISHIZAKI
    2007 Volume 73 Issue 3 Pages 155-161
    Published: 2007
    Released on J-STAGE: September 06, 2007
    DOIhttps://doi.org/10.3186/jjphytopath.73.155
    JOURNAL FREE ACCESS
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    A semiselective medium for isolating benomyl-resistant strains of strawberry anthracnose fungus Glomerella cingulata (Stoneman) Spaulding et Schrenk was developed, and the infection site and habitat of the fungus were investigated. Potato sucrose agar was used for basic medium and supplemented with 50 mg/l benomyl, 30 mg/l triflumizole, 100 mg/l oxgall and 50 mg/l streptomycin sulphate. The growth of benomyl-resistant strains was not inhibited with semiselective medium, but the growth of other fungi and bacteria was inhibited. G. cingulata was isolated from leaflets, petioles, crowns of latently infected plants, and dead plants at high frequency. The fungus was also isolated from the potting medium of diseased plants. Isolation frequency from leaflets, petioles and bases of petioles in the outer leaf position on latently infected plants was higher than from those on inner leaves. Nursery plants inoculated by drenching discolored, wilted and died without black leaf spots symptom. When drench-inoculated with the conidia suspensions (105–106/ml), whole plants wilted and died. Wilt symptom was still observed when plants were inoculated with the suspensions (<102/ml). The fungus was isolated from roots at high frequency. After conidia suspensions (105/ml) of G. cingulata were poured on peat-vermiculite, sawdust and sand for nursery medium, the fungus was consistently isolated from those media over a one-month period. These results showed that G. cingulata had latently infected leaflets, petioles, bases of petioles and crowns of strawberry plants, and had survived in nursery media over a one-month period in the absence of plants.
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Short Communication
Disease Note
  • Bacterial rot of endive (Cichorium endivia L.) caused by Pseudomonas cichorii.
    H. SUENAGA, A. KAWAGUCHI, S. SASAKI, K. INOUE, H. NASU
    2007 Volume 73 Issue 3 Pages 172-174
    Published: 2007
    Released on J-STAGE: September 06, 2007
    DOIhttps://doi.org/10.3186/jjphytopath.73.172
    JOURNAL FREE ACCESS
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    A new bacterial disease, causing water-soaked, blight and rot of leaves and stems, was observed on endive, Cichorium endivia L., in Okayama Prefecture in October 2002. The bacterium isolated at high frequency from affected petioles of endive was identified as Pseudomonas cichorii on the basis of bacteriological characteristics and the 16S rDNA sequence. Healthy seedlings were inoculated with the isolated bacterium, symptoms of the disease were reproduced, and the bacterium was reisolated from the lesions. The name "bacterial rot" was proposed for the disease.
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Abstracts of the Papers Presented at the 2007 Annual Meeting
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