. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. 42 California Agricultural Extension Service [Cir. 119 the cruciferous crops in the coast districts of California but is not usually serious enough to require treatment. On broccoli, brussels sprouts, and cauliflower, it sometimes disfigures the leaves rather badly and increases during transit to market. Spraying v^ith bordeaux mixture 4—4-50 (p. 100) when the plants are young and before the disease appears has been. Fig. 22.—Ring spot on cauliflower leaf. tried, but no very definite re
. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. 42 California Agricultural Extension Service [Cir. 119 the cruciferous crops in the coast districts of California but is not usually serious enough to require treatment. On broccoli, brussels sprouts, and cauliflower, it sometimes disfigures the leaves rather badly and increases during transit to market. Spraying v^ith bordeaux mixture 4—4-50 (p. 100) when the plants are young and before the disease appears has been. Fig. 22.—Ring spot on cauliflower leaf. tried, but no very definite results have been observed. A spreader (p. 105) should be added to the spray. Root Rot.—Diseased plants wilt suddenly (fig. 23), and the leaves turn red to purple, with a rotting of the underground part of the stem and root system. Plants of all ages are susceptible. This disease, which is caused by a fungus, Phytophthora megasperma, occurs in winter plant- ings of cauliflower, cabbage, brussels sprouts, and related plants in the coastal regions. Low, excessively wet or poorly drained areas and low temperatures favor infection. This trouble can best be prevented by proper leveling of the field be- fore planting to avoid low areas which are subject to waterlogging. Virus Diseases.—In addition to the two crucifer virus diseases pre-. 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, Univ. of Calif.
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Keywords: ., bookcentury1900, booksubjectagriculturalpests, booksubjectplantd
