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- [21] PARTIAL RESISTANCE IN LETTUCE TO DOWNY MILDEW (BREMIA-LACTUCAE) .2. DIFFERENTIAL INTERACTIONS BETWEEN PLANT GENOTYPES AND FUNGUS RACES AND THE RELATIONSHIP OF LATENT PERIOD, INFECTION FREQUENCY AND NUMBER OF INFECTED-LEAVES WITH THE LEVEL OF PARTIAL RESISTANCE EUPHYTICA, 1982, 31 (01) : 73 - 83