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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64 California Agricultural Extension Service (Gib. 118 common or important in California but has been reported in very humid localities or hothouses. Mosaic.—The leaflets of affected plants growing under greenhouse conditions show distinct yellowish, chlorotic areas, especially along the midribs, and may be puckered or distorted (fig. 27). The blossoms are reduced in number and are often imperfect, pale, and lopsided. The symptoms vary with the variety and with conditions under which the plants are grown. Out-of-door roses, while showing leaf symptoms (fig.
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Rose mosaic disease. 27) seldom seem to be injured seriously. Ragged Robin, Manetti, multi- flora, and Rosa odorata, commonly used as rootstocks for budding and grafting, are susceptible, and the use of diseased stock is a factor in the perpetuation of the disease; for the virus causing the disease is trans- ferred to healthy plants by buds and grafts. Several other virus diseases of minor importance have been discovered on roses. Diseased-appearing plants should not be set in the benches for forcing, and any that are found to be affected should be destroyed. Great care should be taken not to take buds or cuttings from bushes which show this condition. Nurserymen should be certain that their rootstocks are free from mosaic before using them for budding.

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