ISHS Acta Horticulturae 44: IX International Symposium on Fruit Tree Virus Diseases
CROP REDUCTION IN PEAR TREES CAUSED BY VIRUS INFECTION |
| Author: | A. Thomsen |
| Abstract:
Four virus diseases, rough bark of pears, vein yellow, pear ring mosaic and stony pit, decreased the yield during a 7 year period in the pear varieties 'Beurré Hardy', 'Bosc', 'Clara Frijs' and 'Williams'. Rough bark disease stunted the affected trees considerably, and fruits from stony pit affected trees were of no value. | |
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