Abstract
The correlation between resistance levels of seedlings with cotyledons only and leaf discs taken from young and old leaves on the one hand and the resistance of adult plants in bicyclic field tests on the other was investigated. Components of resistance were: latent period (LP) the percentage of seedlings (SEED) or the number of cotyledons (COT) infected, the number of sporangiophores (SPOR) per cotyledon or leaf dise and the % of the surface (SURF) per cotyledon or disc covered with sporangiophores.
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