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Figure 1 Average use of plant protection products in the former 15 EU member states for
the nine most important crops. Source:
EU-Study Contract No AGR 30881 of 30/12/2002 Study on the Use of the Varieties
of Interspecific Vines
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Figure 2 Schematic representation of milestones in grapevine resistance breeding in
relation to a rough time frame. American and French hybrids are generally of
poor quality and must be considered as an intermediate step in grapevine
breeding. Breeding programs started later revealed high quality fungus
resistant varieties with several excellent breeding lines forthcoming.
Development of genetically modified (GM) varieties ready for the market remains
a long-term goal
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Figure 3 The two strategies which can be followed
to improve grapevine and their outcome are indicated. Improved new varieties
from conventional breeding proved to be successful and first varieties have
been accepted on the market. Improved traditional varieties obtained by gene
transfer are a long-term goal. It is expected that varietal quality
characteristics are not changed as far as improvements for resistances are
concerned
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Figure 4 History of variety Regent
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Figure 5 Degree of downy mildew infection on berry and leaf of Regent compared to
standard varieties (1 = no infection, 9 = heavy infection; n = No. of
observations). Note:
No sprayings of Regent for downy mildew; normal spraying program for varieties
of comparison
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Figure 6 Degree of powdery mildew infection on berry and leaf of Regent compared to
standard varieties (1 = no infection, 9 = heavy infection; n = No. of observations ).
Note:
No sprayings of Regent for powdery mildew; normal spraying program for
varieties of comparison
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Table 1 Calculation of production costs of fungus susceptible varieties compared to
varieties with fungus resistance.< Source:
EU-Study Contract No AGR 30881 of 30/12/2002 Study on the Use of the Varieties
of Interspecific Vines
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Table 2 Results of evaluation tests in different German vinegrowing areas (performance
characteristics)
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