. Diseases of field crops. Plant diseases. 30 California Agricultural Extension Service tClR- 12l rough, warty condition develops on the backs of the leaves (fig. 21). The main roots sliow a mass of hairy secondary roots and pronounced black rings in cross section. All the various plants of the beet family, includ- ing sugar beets, table beets, and Swiss chard, are affected by curly Fig. 21.—Young beet plant affected with curly top. Many other kinds of plants are also susceptible, the most important being the tomato, in which the disease was first called "western yellow
. Diseases of field crops. Plant diseases. 30 California Agricultural Extension Service tClR- 12l rough, warty condition develops on the backs of the leaves (fig. 21). The main roots sliow a mass of hairy secondary roots and pronounced black rings in cross section. All the various plants of the beet family, includ- ing sugar beets, table beets, and Swiss chard, are affected by curly Fig. 21.—Young beet plant affected with curly top. Many other kinds of plants are also susceptible, the most important being the tomato, in which the disease was first called "western yellow ; For other hosts, see the general discussion of this disease (p. 68). Curly top is an extremely sporadic disease, being \evy abundant and destructive some years and again almost absent. The cause of the disease is a virus. As a rule it is more common in the warmer interior valleys and. 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 Smith, Ralph E. (Ralph Eliot), 1874-1953. Berkeley, Calif. : College of Agriculture, University of California
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