Developing Verticillium resistant rootstock for Norway maple J.A. (2002): Developing Verticillium resistant rootstock for Norway maple. Plant Protect. Sci., 38: 232-234.
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Verticillium wilt causes serious losses in the cultivation of shade trees, especially Norway maple (Acer platanoides L.).
In 1993 research was started aiming at the development of Verticillium resistant rootstocks for Norway maple. Efficient
methods to select and screen for resistance in maple were developed, leading to several large-scale selection experiments
carried out in the period 1994–1996. This resulted in a first selection of about 300 plants out of a total of nearly 20 000 seedling
plants. An attempt was made to propagate these plants vegetatively in order to develop small clones for resistance
testing. During this stage of the research many plants were lost because of failure to propagate. After a second screening
for resistance 35 plants were selected for further examination. Vegetative propagation was continued and from 2000 on
the performance of about 15 clones could be tested on naturally infested fields as well as after inoculation. The results
of the field test show a clear selection response with disease incidence in plants of the selected clones being 50% less
than in the seedlings and the randomly chosen clones. Within the group of selected clones there was a substantial variation
between the clones with some clones having no disease at all whereas in other clones some plants showed serious
symptoms. Results of the field tests will be presented and the possibilities for solving the Verticillium wilt problem in
maple by means of using clonal root-stocks that are resistant to Verticillium wilt will be discussed.
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