. Agriculture for the Kansas common schools. Agriculture. PLANT DISEASES 337 up into so-called "; Bees and other insects visit diseased trees and get the bacteria on their feet, then fly to the blossoms of healthy trees and leave some of the bacteria inside the flowers. These flow- ers become infected and die, and the bacteria work their way into the plant juices, clogging the food channels in the twigs. Diseased twigs wilt and finally die. Some of the bacteria live over winter in the twigs, and in this way carry the disease over from year to year. To control the disease it i
. Agriculture for the Kansas common schools. Agriculture. PLANT DISEASES 337 up into so-called "; Bees and other insects visit diseased trees and get the bacteria on their feet, then fly to the blossoms of healthy trees and leave some of the bacteria inside the flowers. These flow- ers become infected and die, and the bacteria work their way into the plant juices, clogging the food channels in the twigs. Diseased twigs wilt and finally die. Some of the bacteria live over winter in the twigs, and in this way carry the disease over from year to year. To control the disease it is necessary to destroy all sources of infection. Diseased twigs, limbs, and "mummies" must be collected and burned, and sometimes whole trees must be destroyed. Spraying. There is no cure for fungous diseases. By spraying, some material poisonous to a fungus spore is spread as a thin film on the foliage of plants for protection. Germinating spores which come into contact with this poison are killed. Spraying, therefore, is a safeguard against disease rather than a cure. Three diseases com- mon in Kansas, which may be controlled by spraying, may be taken as examples. Early Blight of Potatoes. The early blight of potatoes is caused by a fungus which produces "target-board," or "frog-eye," markings on the surface of the leaves. The 2?. A pear twig affected by pear 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 Call, Leland Everett, 1881- [from old catalog] comp; Kent, Harry Llewellyn, [from old catalog] joint comp. Topeka, The State of Kansas state printing plant
Size: 1403px × 1782px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
