Abstract
SUMMARY (1) The density and distribution of European canker (Nectria galligena) on all combinations of four scion and interstock cultivars in an orchard of 10 yr old trees in the Lower Mainland of British Columbia were determined. (2) There was no effect of interstock cultivar upon tree mortality, but there were large scion cultivar effects. The numbers of cankers and degree of aggregation of cankers on surviving trees followed a pattern similar to that of tree mortality. Trees of the cultivars 'Summerland Red McIntosh' and 'Harrold's Delicious' were quite susceptible to buildup of canker and subsequent death, while 'Spartan' and 'Golden Delicious' proved relatively resistant. (3) Multiple regression analysis indicated that the number of cankers per tree was significantly related to the sum of the cankers on the eight surrounding neighbours of each tree. (4) Trunk cross-sectional area was significantly correlated with the number of cankers per tree on McIntosh and Spartan trees. However, it was shown that differences in tree size alone did not account for the differences in numbers of cankers on the four scion cultivars. (5) It was concluded generally that scion cultivar and European canker may act in conjunction and result in a heterogeneously stunted apple orchard.
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