Growth and fruit characteristics in Japanese pear trees cv. 'Chikusui' showing severe symptoms of rough bark disorder
2007
Nitta, H.(Hiroshima-ken. Inst. of Fruit Tree Research, Higashihiroshima (Japan))
Trees of Japanese pear 'Chikusui' growing in Hiroshima Prefecture were identified that displayed severe rough bark symptoms on new shoots, and the influence of this disorder on the amount of tree growth and on fruit characteristics was investigated. The following conclusions were drawn. 1. From the survey, the trunk circumference and length of the primary scaffold limb of affected trees had grown less in the 5 years after top grafting compared to healthy trees. Moreover, fewer fruits were produced as the amount of tree growth decreased. However, there was no hollowing of the surface of fruit on affected trees. 2. In a subsequent examination, affected trees showed less growth from grafting to 6 years after planting compared to healthy trees. Moreover, fewer fruits were produced as the amount of tree growth decreased. 3. In a subsequent examination, the average weight, sugar content and pH of individual fruit from affected and healthy trees were almost equal and there was no hollowing of the surface of fruit on affected trees. 4. From these results, it was judged that the disorder had no adverse effect on major fruit characteristics even though affected trees showed less growth and produced fewer fruits than healthy trees.
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