. Farm horticulture, prepared especially for those interested in either home or commercial horticulture. Vegetable gardening; Fruit-culture. 112 THE PESTS OF CULTIVATED PLANTS of the plant. This is usually attributed to the fact that the transpiration of water from the leaves is greater than the absorption by the roots. A similar condition is also noted when insects, such as the cutworms or the wireworms are eating the roots, thus cutting off the supply of food and water and causing the plant to turn yellow. The yellowing of plants also results from the presence of gases, either in the atmosph
. Farm horticulture, prepared especially for those interested in either home or commercial horticulture. Vegetable gardening; Fruit-culture. 112 THE PESTS OF CULTIVATED PLANTS of the plant. This is usually attributed to the fact that the transpiration of water from the leaves is greater than the absorption by the roots. A similar condition is also noted when insects, such as the cutworms or the wireworms are eating the roots, thus cutting off the supply of food and water and causing the plant to turn yellow. The yellowing of plants also results from the presence of gases, either in the atmosphere or in the soil. This trouble is often found in cities where leaks occur in the gas mains, and it does great damage to shade trees and to ornamental shrubs. Where the root and the crown of the plant are injured from gas it results in the improper physiological process go- ing on, which in turn pre- vents the transpiration of water and the entire plant is affected. The turning brown of little patches on the leaf with the dead portion finally falling out, leaving a small hole in the leaf, is usually a clear sATiiptom of a fungous trouble. The brown and the discolored areas on fruit, such as the rots of the apple or the peach, are the outward signs of a fungous disease. The abnormal swelling of certain portions of some plants are indications that they are affected with some organism. Two well-defined examples of abnormal swellings. Fig. 51.—A diseased tomato 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 Hood, George William, 1886-. Philadelphia, New York, Lea & Febiger
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