Infection without Symptom Appearance of Fusarium oxysporum f. sp. melonis on Cucurbita ficifolia.

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  • NOMURA Yoshikuni
    Kurume Branch, National Research Institute of Vegetables, Ornamental Plants and Tea Toyama Vegetableand Ornamental Crops Reserch Station

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  • メロンつる割病菌のクロダネカボチャへの無病徴感染
  • メロン ツルワレビョウキン ノ クロダネカボチャ エ ノ ム ビョウチョウ カ

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Abstract

Pathogenicity of Fusarium causing wilts on Cucurbitaceous plants was examined. Cucurbita ficifolia and C. maxima were attacked by Fusarium oxysporum f. sp. lagenariae, but not by F. oxysporum f. sp. melonis, f. sp. cucumerinum, f. sp. niveum and f. sp. luffae. But C. ficifolia was infected with F. oxysporum f. sp. melonis without external symptom, because the pathogen was isolated in a high rate from the hypocotyl tissues with browned vascular bundles. Therefore it was considered that C. ficifolia infected with F. oxysporum f. sp. melonis might wilt acutely under bad conditions. On the other hand, neither symptom nor symptomless infection by the above five pathogens was recognized in C. moschata, C. pepo and C. maxima×C. moschata.

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