POSSIBLE RELATIONSHIP BETWEEN THE CAUSAL AGENT OF DAPPLE APPLE AND SCAR SKIN
In current fruiting season after inoculation, fruits produced on the four cultivars did not show any symptoms. One year after inoculation, fruits of each cultivar reacted with different symptom types to each inoculum. However, two and three years after inoculation, symptom types of fruits were the same irrespective of inoculum within each cultivar, although differences were observed between cultivars.
From these results, a close relationship between the causal agent of dapple apple and of scar skin was suggested. This is, however, not yet conclusive until attempts to isolate the causal virus and to back-transmit to apple are accomplished.