File:Diseases of fruits and nuts (1941) (20346120134).jpg

Title: Diseases of fruits and nuts
Identifier: diseasesoffruits120smit (find matches)
Year: 1941 (1940s)
Authors: Smith, Ralph E. (Ralph Eliot), 1874-1953
Subjects: Fruit; Nuts
Publisher: Berkeley, Calif. : The College of Agriculture, University of California
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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90 California Agricultural Extension Service (Cir. 120 mended for apple (p. 21), gives good control. This also controls blight (Coryneum) if applied before December 15, but does not prevent leaf curl. Little Peach.—In this virus disease, the foliage is yellow and the fruit very small and late in ripening. The disease spreads rapidly through an orchard and kills the trees within about four years. Little peach has been most serious in Michigan and other northern states and has never been known in California. Prompt eradication of affected trees is the only known method of control.
Text Appearing After Image:
Fig. 41.—Eosette disease of Muir peach: A, on leaves; B, on blossoms. Mosaic.^*—Foliation in spring is retarded on trees affected with mo- saic, and the young leaves are yellow, dwarfed, and deformed. Twig growth is shortened or "bunchy," flowers may be mottled in color, and the fruit roughened and deformed. These symptoms are not displayed uniformly by all varieties of peaches. As a rule, those of the J. H. Hale and Elberta type are the most severely affected, while the clingstone canning varieties are more tolerant. The disease, caused by a virus, is spread by budding or grafting and by some unknown natural method, possibly insects, from tree to tree. An orchard may be ruined within a few years after mosaic is introduced. There is no known remedy or treatment for this disease except to de- stroy affected trees as soon as they show mosaic. Efforts are being made 2*For further information, see: Hutchins, Lee M., E. W. Bodine, and H. H. Thornberry. Peach mosaic, its identification and control. U. S. Dept. Agr. Cir. 427:1-48. 32 figs. 1937.

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