. Diseases of economic plants. Plant diseases. 186 Diseases of Economic Plants and middle states, and causes large loss. Affected fruits rot into a soft, slimy, wet mass, this occurring often in transit. On the leaves dark, watery spots, 3-5 mm. in diameter, ap- pear. The spots later become dry and brown, and the brittle tissue usually falls away, leaving a ragged, irregular hole. Spots on the fruit are at first small, 2-3 mm., and watery, and exude a gummy liquid which later dries to a white residue. Infection proceeds to the interior, and in a few days the central portion becomes a rotten ma
. Diseases of economic plants. Plant diseases. 186 Diseases of Economic Plants and middle states, and causes large loss. Affected fruits rot into a soft, slimy, wet mass, this occurring often in transit. On the leaves dark, watery spots, 3-5 mm. in diameter, ap- pear. The spots later become dry and brown, and the brittle tissue usually falls away, leaving a ragged, irregular hole. Spots on the fruit are at first small, 2-3 mm., and watery, and exude a gummy liquid which later dries to a white residue. Infection proceeds to the interior, and in a few days the central portion becomes a rotten mass. Young fruits are especially susceptible. Care should be taken in picking to avoid wounding the fruit, and all affected fruits should be most scrupu- lously sorted out of lots that are for ship- ment. The season's ing upon a muskmelon at point of con- infection may originate tact with the soil. After Hume. ^.^^^^ ^^^^ ^j^^^^^^ seed or from soil. The use of seeds treated with mercuric chlorid reduces infection. Mosaic. "^^'^^^ — Two mosaic diseases of cucurbits are: the White-pickle-mosaic, which affects many hosts, and the Mottled-leaf-mosaic, common to only a few hosts. The status of knowledge is much as in the case of other mosaics. See p. 258. Inoculations are readily made by rubbing. In the field, infection is carried by beetles and by the pickers. Experiments have shown 18 species in 10 genera of cucurbits. Fig. 102. — Sclerotium rolfsii Sacc. grow-. 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- [from old catalog]; Hall, John Galentine, 1870- [from old catalog] joint author. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1921
