Abstract
SUMMARYMost leaf‐scar infections of cherry trees are caused by bacteria washed from the leaf surfaces in rain. In estimates made from three young orchards in four different seasons the numbers of Pseudomonas mors‐prunorum on the leaf surfaces of the cherry variety Napoleon during the autumn were consistently higher than those on the more resistant variety Roundel, the ratio on occasion exceeding three to one. The amount of leaf surface inoculum and the number of cankers on each variety increased progressively with the age of the trees, but both were unrelated to the severity of leaf‐spot infection, which fluctuated widely from year to year. The possibility of epiphytic growth by the pathogen and the relationship between inoculum potential and ‘field’ resistance of the varieties are discussed.
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