. Complete farmer's guide. Agriculture; Farm life. [from old catalog]. PLANT ENEMIES 27: Fig. 173. The bacteria that cause pear blight.—Ajler Warren. difficult to get rid of by the fact that many of them may hve also on weeds and other vegetation besides the cul- tivated crops, as the apple rust lives on cedar-trees, where it causes the cedar-balls. From such places these disease-produ- cing fungi are carried back to the cultivated crops. Bacteria are, as you know, one- celled plants that multiply by di- viding, just as the cells do in the cambium layer. The disease-pro- ducing bacteria, when
. Complete farmer's guide. Agriculture; Farm life. [from old catalog]. PLANT ENEMIES 27: Fig. 173. The bacteria that cause pear blight.—Ajler Warren. difficult to get rid of by the fact that many of them may hve also on weeds and other vegetation besides the cul- tivated crops, as the apple rust lives on cedar-trees, where it causes the cedar-balls. From such places these disease-produ- cing fungi are carried back to the cultivated crops. Bacteria are, as you know, one- celled plants that multiply by di- viding, just as the cells do in the cambium layer. The disease-pro- ducing bacteria, when once they are successfully lodged on or within a plant, multiply with enormous rapidity and are blown about the field by the wind or carried by insects and birds from infected to sound plants. The bacteria frequently find a lodgement more easily when they fall on a cut or bruised surface, or upon blos- soms or very tender buds, as is the case with the bacterium caus- ing pear blight. 248. How to Control Plant Dis- eases.—Nowhere is it more true that "an ounce of prevention is worth a pound of cure" than in the handling of plant diseases. When once the fungus or bacte- rium is within the tissue of the plant, there is no successful way known of reaching it. Then all that can be done is to prevent the further spread by spraying, and by cutting ofi^ and burning diseased parts, or even an entire tree or Fig. 174. Spores of brown rot of peach.—A//er 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 Kyle, Edwin Jackson. [from old catalog]; Ellis, Alexander Caswell, 1871- [from old catalog] joint author. New York, Chicago [etc. ] C. Scribner's sons
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