. Diseases of flowers and other ornamentals. Flowers; Plant diseases. Wm. 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 bu
. Diseases of flowers and other ornamentals. Flowers; Plant diseases. Wm. 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. 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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Keywords: ., bo, bookcentury1900, booksubjectflowers, booksubjectplantdiseases
