Articles
VIRULENCE ANALYSIS OF VENTURIA INAEQUALIS POPULATIONS
Article number
422_97
Pages
400 – 401
Language
Abstract
To study virulence variability in scab populations, a cross infection trial was carried out in a phytotron.
Specific virulences of monoconidial inoculum from 5 different orchards were detected with a set of 8 to 10 old cultivars (differentials). The number of phenotipically distinguishable isolates and their complexity (average number of specific virulences per isolate) generally increased with the number of varieties in the orchard.
In orchards with 3 or more cultivars, no isolate could infect all the cultivars present in the orchard.
All differentials, even very susceptible ones like Golden Delicious and Champagner Reinette, showed differential resistances.
To achieve the aim of a durable resistance, differential resistances could be an important tool for future breeding strategies.
Specific virulences of monoconidial inoculum from 5 different orchards were detected with a set of 8 to 10 old cultivars (differentials). The number of phenotipically distinguishable isolates and their complexity (average number of specific virulences per isolate) generally increased with the number of varieties in the orchard.
In orchards with 3 or more cultivars, no isolate could infect all the cultivars present in the orchard.
All differentials, even very susceptible ones like Golden Delicious and Champagner Reinette, showed differential resistances.
To achieve the aim of a durable resistance, differential resistances could be an important tool for future breeding strategies.
Authors
Th. Koch, M. Kellerhals, C. Gessler
Keywords
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