File:Diseases of flowers and other ornamentals (1940) (20941990846).jpg

Title: Diseases of flowers and other ornamentals
Identifier: diseasesofflower118smit (find matches)
Year: 1940 (1940s)
Authors: Smith, Ralph E. (Ralph Eliot), 1874-1953
Subjects: Flowers; Plant diseases
Publisher: Berkeley, Calif. : College of Agriculture, University of California
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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Fig. 14.—Narcissus leaves showing stem-nematode effect. a planting of bulbs of mosaic, whereas carelessness about the disease may soon bring about the ruin of the entire stock. Nematode, Eelworm, Stem Nematode.—Affected leaves are yellow and twisted and show yellowish, elongated, raised streaks or ridges on the surface (fig. 14). When the bulb is cut across, dark-brown rings are prominent in the scales. Living worms (Ditylenchus dipsaci) may be seen with a low-power microscope or hand lens (fig. 15) if bits of leaf or bulb tissue are crushed in water. Badly infested stocks should be entirely destroyed unless they are of exceptional value. Affected plants should be rogued out in the field as soon as they can be detected, and the plant on either side taken out. Planting stock should be carefully sorted before and after treatment to remove all bulbs showing signs of decay or injury. Treatment consists in dipping the bulbs in water at a temperature

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