ビワたてぼや症（新称）とその原因

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タイトル別名
  • Causal Factors of Tate-Boya, a New Disease of Loquat Fruit.
  • ビワタテ ボヤショウ シンショウ ト ソノ ゲンイン

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A new disease occurred on loquat fruit with “Tate-boya” symptoms, several longitudinal lines with splashed patterns on the surface of the fruit from the bracts to the tips of fruit, resembling the appearance of an “abrasion”, hence the name of Tate-boya. Scanning electron microscope (SEM) examinations of the symptomatic fruit surface showed signs of suctioning by the loquat rust mite (Aceria sp.), as well as conidia and mycelia of various filamentous fungi. No such signs or symptoms were recognized on fruits from which the bracts were artificially picked off in early stage of development. In bracteate cavities on diseased fruits many loquat rust mites could be seen. A Botrytis sp. was most frequently isolated from the inside of the bracts as well as from the diseased parts of the fruit. Tate-boya symptoms were found only when both the Botrytis sp. and loquat rust mite were found together within the bracteate cavities. Tate-boya symptoms could be reproduced when conidial suspensions of the Botrytis sp. were injected into bracteate cavities which were inhabited by the loquat rust mite. No other species of isolated fungi could reproduce the disease. The Botrytis sp. was identified as Botrytis cinerea Pers.: Fr., the common gray mold fungus, on the basis of morphology and cultural and pathogenicity studies.

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