. The blight canker of apple trees ... Apples. 'The Blight Canker of Apple Trees 13 pear tree, with the result that typical cankers appeared in botli cases. Blossoms and growing twigs of both pears and apples were also inoculated with bacteria from this same canker. These nearly all developed good cases of blight in about ten days, while twigs and blossoms punctured with a sterile needle gave no infection. This last experiment was twice repeated during. Fig. 11—Pruned stub canker. In- fected at time of pruning, probably by the saw. Note the color of dead bark. PlG. 1-—Canker formed about the m
. The blight canker of apple trees ... Apples. 'The Blight Canker of Apple Trees 13 pear tree, with the result that typical cankers appeared in botli cases. Blossoms and growing twigs of both pears and apples were also inoculated with bacteria from this same canker. These nearly all developed good cases of blight in about ten days, while twigs and blossoms punctured with a sterile needle gave no infection. This last experiment was twice repeated during. Fig. 11—Pruned stub canker. In- fected at time of pruning, probably by the saw. Note the color of dead bark. PlG. 1-—Canker formed about the mouth of the burrow of a borer near base of an apple tree. the summer with pure cultures of the bacteria from the apple tree canker. The blighl resulted in practically every case. young fruits of both the pear and apple were also Inoculated and gave well developed cases of the disease. By a compara- tive study in various culture media of the bacteria from cank- ers, twigs and fruits of both pear and apple obtained from dif- ferent orchards about [thaca the organism of the canker was shown to be identical with that of the well-known "lire blight" of Ihe pear and "twig blight" of the apple, Bacillus amylov- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original [Whetzel, Herbert Hice], 1877- [from old catalog]. Madison, Wis.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectapples, bookyear1907
