. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 231 Tubers from diseased vines rot rapidly and should not be stored. If stored, they should be kept at as low a tempera- ture as possible. It is unwise to plant potatoes in land which has shown this disease upon any of its hosts, without a long intervening rotation. The precautions suggested under soil use of clean seed, and special atten- tion to insect control, are preventive measures. Black-leg ''"'•"' -^^- -^^' ^^^^ (Bacillus phytophihorus Appel). —• Much confu- sion has arisen concerning the identity of bla
. Diseases of economic plants. Plant diseases. Vegetable and Field Crops 231 Tubers from diseased vines rot rapidly and should not be stored. If stored, they should be kept at as low a tempera- ture as possible. It is unwise to plant potatoes in land which has shown this disease upon any of its hosts, without a long intervening rotation. The precautions suggested under soil use of clean seed, and special atten- tion to insect control, are preventive measures. Black-leg ''"'•"' -^^- -^^' ^^^^ (Bacillus phytophihorus Appel). —• Much confu- sion has arisen concerning the identity of black-leg, since in many instances the mere occurrence of a black region upon the stem near the ground line has led to the use of the term. It is thus probable that in the literature of potato mal- adies several distinct dis- eases have been confused with black-leg. A distinct, definite, and serious disease has, however, been known in Europe and England for several years under this name. Jones, who studied black-leg in the field in Germany and England and what appeared to be the same disease in Vermont, described it essentially as follows: The earliest conspicuous symptom was that the diseased plants were slightly be- low normal size, of a paler or yellowish-green color, the lateral branches and petioles becoming more erect and the leaf blades curving upward, giving the entire plant a narrowed aspect. The lower leaves, in the meantime, have possibly shriveled and died. The stem was more or less. Fig. 128. — Dry-rot caused by Fusa- rium. 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-. New York, Macmillan
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Keywords: ., bookauthorstevensf, bookcentury1900, bookdecade1920, bookyear1921
