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Crop reduction in pear trees caused by virus infection


, : Crop reduction in pear trees caused by virus infection. Acta Horticulturae (44): 119-122

Four virus diseases, rough bark of pears, vein yellow, pear ring mosaic and stony pit, decreased yields in the pear cvs Beurre Hardy, Bosc, Clara Frijs and Williams' during a 7-year period. Rough bark disease stunted the affected trees considerably.

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