Zone de Texte: In an attempt to achieve uniformity in classification of wart reactions the following was proposed ( EPPO Publication 1962)* R1 Necrosis occurs early in development of sporangia –only approx 5 sporangia/sprout R2 All stages of earlier defence necrosis may be present. Necrosis also present around isolated groups of sporangia At tip of sprout ripe sporangia unlimited in number without necrosis may be present Varieties reacting as R2 are called ‘field resistant’ or ‘immune’ * Using Glynne Lemmerzahl method with time of assessment 18 days Zone de Texte: SASA ??Crown Copyright

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