Saga Prefectural Upland Farming Research and Extension Center

Saga-shi, Japan

Saga Prefectural Upland Farming Research and Extension Center

Saga-shi, Japan
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Natsume M.,Tokyo University of Agriculture and Technology | Tashiro N.,Saga Prefectural Upland Farming Research and Extension Center | Doi A.,Hokkaido Central Agricultural Experiment Station | Nishi Y.,Kagoshima Prefectural Institute for Agricultural Development | Kawaide H.,Tokyo University of Agriculture and Technology
Journal of General Plant Pathology | Year: 2017

Streptomyces scabies, causative agent of common scab of potato, produces the phytotoxins concanamycin and thaxtomin. In a potato tuber slice assay to study the contribution of concanamycins to lesion development, concanamycin A had weak necrosis-inducing activities; >10× the amount of thaxtomin A was needed to produce equivalent lesion severity. Concanamycins were detected in tubers inoculated with S. scabies, which caused deep-pitted lesions but not in those inoculated with Streptomyces acidiscabies, which caused corky, raised lesions. In field-grown, diseased potatoes, concanamycin content tended to be higher in tubers with deep-pitted lesions than in those with corky, raised lesions. © 2017 The Phytopathological Society of Japan and Springer Japan


Tashiro N.,Saga Prefectural Upland Farming Research and Extension Center | Noguchi M.,Saga Prefectural Fruit Tree Experiment Station | Ide Y.,Saga Prefectural Fruit Tree Experiment Station | Ide Y.,Saga Prefectural Agriculture and Plant Protection Center | Kuchiki F.,Saga Prefectural Fruit Tree Experiment Station
Journal of General Plant Pathology | Year: 2013

In June 2006, a large number of small black spots containing a branching network of black hyphae developed on shipped Satsuma mandarin fruits grown in greenhouses, which markedly decreased their commercial value. The fungus that was frequently isolated from the damaged fruits was identified as Cladosporium cladosporioides. Inoculation of fruits with the fungus caused the same symptoms, and the fungus was reisolated from the diseased fruits. The disease caused by this fungus has not been previously documented in citrus fruits; we name this new disease "sooty spot" on the basis of its symptoms. © 2013 The Phytopathological Society of Japan and Springer Japan.


Tashiro N.,Saga Prefectural Upland Farming Research and Extension Center | Uematsu S.,Chiba Prefectural Agriculture and Forestry Research Center | Ide Y.,Saga Prefectural Fruit Tree Experiment Station | Matsuzaki M.,Nihon Nohyaku Co.
Journal of General Plant Pathology | Year: 2012

A fruit rot, similar to brown rot, occurred on extremely early ripening Satsumas in Saga Prefecture in the early autumn of 1999. A single species of Phytophthora was isolated from the affected fruit. After nonwounding inoculation of healthy fruits of Citrus spp. including Satsuma with the isolated fungus, the fungus was reisolated from fruit with symptoms similar to those in nature. On the basis of its morphology and molecular analysis of the rDNA-internal transcribed spacer regions, the pathogen was identified as P. palmivora. This is the first report of P. palmivora as a causal pathogen of citrus brown rot in Japan. © 2012 The Phytopathological Society of Japan and Springer.


Tashiro N.,Saga Prefectural Upland Farming Research and Extension Center | Manabe K.,Nippon Steel Kankyo Engineering Co. | Ide Y.,Saga Prefectural Fruit Tree Experiment Station
Journal of General Plant Pathology | Year: 2012

From July to October 1999, two Japanese pear varieties, Housui and Niitaka, were unexpectedly infected with Colletotrichum gloeosporioides causing anthracnose in Saga Prefecture of Japan. More than 90 % of the anthracnose fungus strains collected in 1999 were highly benzimidazole-resistant and distributed at high frequencies across pear-producing areas. The control of anthracnose by benzimidazole fungicides could not be confirmed in orchards where the isolation frequency of resistant strains was high. The frequency of resistant strains did not significantly decline, even 2-5 years after the last use of benzimidazole fungicides. © 2012 The Phytopathological Society of Japan and Springer.


Tashiro N.,Saga Prefectural Upland Farming Research and Extension Center | Manabe K.,Nippon Steel Kankyo Engineering Co. | Ide Y.,Saga Prefectural Fruit Tree Experiment Station
Journal of General Plant Pathology | Year: 2012

In March 2006, stored fruits of the medium-to-late-ripening citrus variety Shiranuhi ([Citrus unshiu × C. sinensis] × C. reticulata) were found to have a disease similar to blue mold. The fungus causing this disease differed distinctly from the well-known, blue mold agent, Penicillium italicum, because it formed whisker-like coremia measuring 1-8 mm. On the basis of the morphological characteristics and the phylogenetic analysis based on the nucleotide sequence of the β-tubulin gene, the fungus was identified as P. ulaiense. This is the first report of citrus whisker mold caused by P. ulaiense in Japan. © 2012 The Phytopathological Society of Japan and Springer.


Tashiro N.,Saga Prefectural Upland Farming Research and Extension Center | Manabe K.,Nippon Steel Kankyo Engineering Co. | Saito A.,Shizuoka Institute of Science and Technology | Miyashita K.,Japan National Institute for Agro - Environmental Sciences
Journal of General Plant Pathology | Year: 2012

Acid scab of potatoes occurs frequently in strongly acidic soils at pH 3. 9-5. 2. On the basis of the phylogenetic relationships derived from 16S rDNA sequences and physiological characteristics, we identified the organism causing this disease in potatoes grown in the Uwaba district of Saga Prefecture, Kyushu Island, southwest Japan, as Streptomycesacidiscabies. Another pathogen that occurred more frequently in weakly acidic to neutral soils, rather than strongly acidic soils, was identified as S. scabiei. Streptomyces acidiscabies tended to produce superficial lesions, while S. scabiei mostly produced raised and/or erumpent lesions. © 2012 The Phytopathological Society of Japan and Springer.

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