Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
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Volume 86, Issue 1
Remark on 100th of JJP Series 12
Displaying 1-8 of 8 articles from this issue
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  • Effect of hot water disinfection incorporated with pre-drying against rice seedborne diseases
    H. IGA, T. TODA, H. FURUYA, M. KANEKATSU, S. FUJI
    2020 Volume 86 Issue 1 Pages 1-8
    Published: February 25, 2020
    Released on J-STAGE: May 15, 2020
    DOIhttps://doi.org/10.3186/jjphytopath.86.1
    JOURNAL FREE ACCESS
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    Disinfecting rice seeds in hot water at 60°C for 10 min has been widely used in Japan; however, bakanae disease caused by Fusarium (=Gibberella) fujikuroi has become problematic with the popularization of this method because the method is ineffective compared with chemical disinfectants. Recently, pre-drying seeds to reduce seed water content to below 10% was found to improve seed tolerance to heat stress and permit the disinfection at a high temperature of 65°C for 10 min; however, the effect on disease control was not evaluated. In this study, we thus examined whether the combined pre-drying seeds and hot water treatment at 65°C for 10 min improves control of several major seed-borne diseases such as bakanae, blast, bacterial grain rot and bacterial seedling blight. The combined treatment was more effective than hot water disinfection at 60°C 10 min in controlling bakanae disease in the experiment using naturally infected seeds. The combined treatments were especially more effective than other popular methods to control the two bacterial seed-borne diseases. These results indicate that pre-drying seeds before the 10-min 65°C hot water treatment is a practical, effective method to disinfect rice seeds.

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  • Suppressive effect of simeconazole against white rot of welsh onion
    K. IKEDA, H. SAKAI, T. MITSUNAGA
    2020 Volume 86 Issue 1 Pages 9-16
    Published: February 25, 2020
    Released on J-STAGE: May 15, 2020
    DOIhttps://doi.org/10.3186/jjphytopath.86.9
    JOURNAL FREE ACCESS
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    Simeconazole granules were tested for suppression of white rot (Sclerotium cepivorum) of welsh onion (Allium fistulosum) in six trials in two experimental fields, including a naturally infested field, from 2010 to 2013. The influence of the method and timing of simeconazole application, field, and year as explanatory variables were analyzed using a generalized linear model (GLM). In our experimental model, the coefficient of simeconazole treatment applied once at the time of planting and the first earthing-up in reference to the negative control of simeconazole was −1.47. Analysis of deviance for the variable indicated that simeconazole treatment significantly suppressed the disease (p = 0.044). Although the coefficient of simeconazole treatment applied with first and third earthing-up in reference to the negative control was −1.10, the analysis of deviance showed that the variable was not significant (p = 0.255). There was no significant difference between the two simeconazole-application procedures (mixed into soil vs soil-surface dressing) in the GLM analysis done as mentioned above. When the influence of the origin and type of field infection on the results was considered, disease in the artificially and uniformly infested field was more severe than in the naturally and partially infested field. Although more trials are needed to adequately analyze the influence of year on disease outbreak, using the GLM analysis, we demonstrated that simeconazole is an effective suppressive treatment of white rot.

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Feature article for 100th anniversary of Japanese Journal of Phytopathology
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