. Diseases of economic plants. Plant diseases. 254 DISEASES OF ECONOMIC PLANTS wise sound: or again several scales may be rotted. If the outer scale is rotted, the bulbs are designated as " slippery onions " by the growers. The rot does not spread from scale to scale within the bulb. In storage it does not progress rapidly in dry onions, but wet onions do rot. -Onion affected with soft rot; longitudinal and cross section. After Stewart. rapidly. The only suggestion toward control is to keep the onions dry in storage. Black mold (Macrosporium parasiticum Thuem.). — Fre- quently onion
. Diseases of economic plants. Plant diseases. 254 DISEASES OF ECONOMIC PLANTS wise sound: or again several scales may be rotted. If the outer scale is rotted, the bulbs are designated as " slippery onions " by the growers. The rot does not spread from scale to scale within the bulb. In storage it does not progress rapidly in dry onions, but wet onions do rot. -Onion affected with soft rot; longitudinal and cross section. After Stewart. rapidly. The only suggestion toward control is to keep the onions dry in storage. Black mold (Macrosporium parasiticum Thuem.). — Fre- quently onion leaves which have been injured by some cause, also old stems or seed stalks, assume a velvety, black coating which often covers them entirely. This condition follows only upon previous injury, weakening, or death, from some other primary cause, chiefly as a sequel of the downy mildew. Though not a primary disease its pres- ence extends the injury started by other causes, breaks. 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
