Publisher's Synopsis
Excerpt from Blight Canker of Apple Trees
Another source Of infection was found to be the pruning knife. Along one side of an orchard of about 350 trees which was under observation thruout the season, it was early noticed that the pruned stubs, of 1904 especially, showed the collars of dead bark often two or three inches in width (fig. Instead of forming a callus and healing over the wound, as would normally occur, the tissue had died and shriveled up but still clung to the stub. In most cases the bacteria which had caused the death of the bark had died out the first season. In a few instances, however, the canker was observed to be active early in the spring, extend ing down the side of the adjoining limb. Two badly diseased trees on this side of the orchard seem to have been the source of infection. Owing to their diseased condition, they had been severely pruned the previous season and very probably the knife or saw had carried the bacteria to the healthy trees. Flies.
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