Table 3
Mean Fv/Fm of leaf discs of plants of susceptible (‘Neckarriesen’) and resistant (‘Analena’; ‘Veronique’) butterhead and susceptible batavia (‘Maravilla’)
lettuce cultivars on dai 8 and dai 10. Also given is the reduction of Fv/Fm from dai 8 to dai 10. Leaf discs were also classified according to success of infection
and the occurrence of secondary fungal contaminations (cat. A to D).
Fig.