. Fig. 53.—Phytophthora canker of pear. ticularly applicable to cankers which are extensive in area but not yet deep-seated. 3. The method often called "scraping" is similar to the preceding ex- cept that the affected bark is removed entirely down to the wood. This method is preferred by many workers for dealing with large cankers in fall or winter. Any practice, such as light pruning, light watering, or growing an intercrop, that reduces the vigor of the tree growth will diminish some- what the severity of the disease.

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