. The Canadian horticulturist [monthly], 1892. Gardening; Canadian periodicals. 194 The Canadian ^.-tlilby Fig. 47 shows a vertical section of a leaf thus aflfectcd, swollen out of the normal thickness ; a, as above, representing the upper, and b the under surface. The cellular structure of the under sec- tion is very little changed, but the change in the upper portion is easily seen. The walls between each of the cells above have become much thick- ened, and the long narrow cells much swollen and divided. The result will be that the leaf will have a tendency to curl undcrward
. The Canadian horticulturist [monthly], 1892. Gardening; Canadian periodicals. 194 The Canadian ^.-tlilby Fig. 47 shows a vertical section of a leaf thus aflfectcd, swollen out of the normal thickness ; a, as above, representing the upper, and b the under surface. The cellular structure of the under sec- tion is very little changed, but the change in the upper portion is easily seen. The walls between each of the cells above have become much thick- ened, and the long narrow cells much swollen and divided. The result will be that the leaf will have a tendency to curl undcrward. The dark lines in these cells represent the vegetative portion of the fungus, which penetrates among these cells. This These Fig. 47. vegetative portion throws out numerous branches, as shown in Fig. 48 enlarge and form asci or fruiting portions, containing six or seven spores each, which are the means of spreading the disease. Sometimes a somewhat similar effect upon the peach leaves is produced by the peach tree aphis, when it is very abundant. This U^^/' ~]T ^/^^^i louse, by sucking the juice from the under /^^^^^^^l JL lU^^oC""^*^ side of the leaves, cause hollows with cor. ^| / \ )/ 1(~\\^ responding reddish swellings above, and Fig. 48. the leaves, in consequence, are made to curl. These may be destroyed by a decoction of tobacco and water, or by the kerosene 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 St. Catharines, E. S. Leavenworth
Size: 1537px × 1626px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookpublis, booksubjectcanadianperiodicals, booksubjectgardening
