. Diseases of economic plants. Plant diseases. SYMPTOMS OF DISEASE 15 local or general, and may or may not be fol- lowed by rot. Wilt of stems or leaves is caused usually by either a plugging, or other in- terruption, of the sap- carrying veins, or by some injury to the ab- sorbing root system. Spots of leaves, bark, or fruit may be caused by local blight, rot of tissue, im- perfect coloration, or by local over-development or under-development of color. Scab in fruit, leaves, or bark is due to the growth of the causal parasite upon or near the surface, or to or layers of tissue caused Fig. 4.
. Diseases of economic plants. Plant diseases. SYMPTOMS OF DISEASE 15 local or general, and may or may not be fol- lowed by rot. Wilt of stems or leaves is caused usually by either a plugging, or other in- terruption, of the sap- carrying veins, or by some injury to the ab- sorbing root system. Spots of leaves, bark, or fruit may be caused by local blight, rot of tissue, im- perfect coloration, or by local over-development or under-development of color. Scab in fruit, leaves, or bark is due to the growth of the causal parasite upon or near the surface, or to or layers of tissue caused Fig. 4. — Sori of rust of asparagus. Original. thickening of the outer layer by the irritation of a Fig. 5. Hyphae in a leaf spot much enlarged. Redrawn after 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 Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870- joint author. New York, The Macmillan Company
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1910, bookyear1910
