Abstract
Mixed inoculum of two isolates differing in virulence were inoculated in various proportions by three methods on susceptible Taichung Native 1 and resistant BJ 1 varieties. High infection scores on Taichung Native 1 resulted from the three methods of inoculation, when all combinations of low virulent to high virulent isolates were used. On BJ 1 no inhibition in lesion development was observed at 1:1 proportion of low virulent to high virulent cells, but at 20:1 the lesion development was considerably inhibited. The multiplication of virulent isolate in BJ 1 was considerably lower in the latter combination. Field inoculation of mixed cultures of one highly virulent isolate and seven other isolates differing in virulence and origin gave good infection on Taichung Native 1 but low disease on BJ 1.
