. Diseases of economic plants . Plant diseases. 2U DISEASES OF ECONOMIC PLANTS shown in the accompanying fig:ure. It cannot be con- founded with any other disease unless it be that caused by eel worms (nematodes), and from this it may be easily dis- tinguished by the greater magnitude of the club-root galls. These enlargments may be noted in the seed bed, though they are usually overlooked until they be- come larger in the field. The J- so diminish the vigor of the plant that it assumes a sickly appearance, ceases to develop, and fails to head. The affected parts usually succvnnb to offen- siv
. Diseases of economic plants . Plant diseases. 2U DISEASES OF ECONOMIC PLANTS shown in the accompanying fig:ure. It cannot be con- founded with any other disease unless it be that caused by eel worms (nematodes), and from this it may be easily dis- tinguished by the greater magnitude of the club-root galls. These enlargments may be noted in the seed bed, though they are usually overlooked until they be- come larger in the field. The J- so diminish the vigor of the plant that it assumes a sickly appearance, ceases to develop, and fails to head. The affected parts usually succvnnb to offen- sive secondary rots, the causal organism is released, and the soil is thus infected. The proof of the parasitic origin of this disease was made by Woronin in 1873, after three years of inten- sive study. In general the precautions against its spread are those suggested under the general heading soil diseases. All diseased refuse is infective, as is also manure to which it has had access. Fields which are diseased remain so for several years; therefore rotation to nonsusceptible crops should be followed. Seedlings should be examined care- fully to guard against the use of plants from an infected. Fig. 97. — Cabbage club root. 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, bookdecade1910, bookyear1910
