INFLUENCE OF CULTIVAR AND LOW QUANTITY OF WATER ON DISEASE-CONTROL INSCORZONERA

During 1988-1991, trials on disease control were investigated with Sco rzonera cv. 'Keukenfee', a low sensitive cultivar to Erysiphe and 'Fla ndria', a sensitive cultivar. The mixture bitertanol + chlorothalonil (225 + 1500 g/ha a.s.) was applied with different doses of water, nl. 1000, 500 and 100 1 per ha. 'Keukenfee' is little sensitive in compari son with 'Flandria'. Between the three spray-mixtures, differences in activity against white rust and powdery mildew were not observed. The different quantities of water did nor cause clear differences in yield and quality. A high saving of costs has been obtained by the use of a less susceptible cultivar to Erysiphe.