Viruses and phytoplasma in European pear trees in New Zealand and the role of these pathogens in the compatibility of pear with quince rootstocks
作者:
G. A. Wood,
期刊:
New Zealand Journal of Crop and Horticultural Science
(Taylor Available online 1997)
卷期:
Volume 25,
issue 4
页码: 333-340
ISSN:0114-0671
年代: 1997
DOI:10.1080/01140671.1997.9514024
出版商: Taylor & Francis Group
关键词: Pyrus;pear cultivars;pear rootstocks;Cydonia;quince rootstocks;virus disease;phytoplasma disease;disease testing
数据来源: Taylor
摘要:
The history of European pear(Pyrus communisL.) cultivars, and pear and quince(Cydonia oblongaMill.) rootstocks used in New Zealand during the present century was investigated in relation to their virus and phytoplasma disease status. Early attempts to control tree size and vigour using quince clonal rootstocks or seedlings of Oriental pear(P.pyrifoliaBurm. Nak.) were unsuccessful, in part because of the presence of these diseases, and pear trees were grown for most of this century on European pear seedling rootstocks. Testing of 12 older pear cultivars commonly grown in commercial orchards at the present time showed that most were infected with several viruses, and also with the phytoplasma disease apple rubbery wood. All of the 12 cultivars were imported before, or at the beginning of this century, and were likely to have been infected in their country of origin before being introduced to New Zealand. When freed from infection by heat therapy, some were successfully grown on the virus‐free East Mailing rootstocks ‘Quince A’ and ‘C, and on the French rootstock ‘Quince BA 29’ without incompatibility problems, but others required an intermediate such as ‘Beurre Hardy’ to overcome non‐pathogen induced incompatibilities.
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