File:California plant diseases (1911) (19892641854).jpg

Title: California plant diseases
Identifier: californiaplantd218smit (find matches)
Year: 1911 (1910s)
Authors: Smith, Ralph E. (Ralph Eliot), 1874-1953; Smith, Elizabeth H. (Elizabeth Hight), 1877-1933
Subjects: Plant diseases
Publisher: Berkeley, Cal. : Agricultural Experiment Station
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
Bulletin 218) CALIFORNIA PLANT DISEASES. 1115 and the sulfuring during the blossoming is needed only for its effect on the setting of the fruit, and as an extra precaution. Sulfuring later, if needed, is a proof that the first two have not been well done. This is true for the whole of the two central valleys and for most of California, except the coast belt subject to sum- mer ocean fog. "Definition of a Thorough and Effective First Sulfuring. —The first sulfuring should be made when the shoots are between 6 and 15 inches long. It should be done in such a way that every part of every leaf of every vine in all parts of the vineyard receives some sulfur, and the whole vine- yard should be gone over in as short a time as possible. This will be a thorough sul- furing. To be effective, it must be followed immediately by two or three days of warm weather. Unless this happens, the sulfuring should be re- peated as many times as are necessary until the proper weather conditions are ob- tained. Black Knot. Figure 45. (California Experiment Station Bulletin 197) : "This is one of the commonest and most widely distributed dis- eases of the vine in California. Many specimens are received by the Experiment Station every year, from nearly all vine-growing sections. It consists of peculiar growths, or swellings, usually near the surface of the ground on the upper parts of the roots or the lower part of the trunk. It often occurs, also, on all parts of the trunk and branches, but only rarely on the canes. 'As a rule it does little damage unless it occurs on young vines, or attacks old vines very severely. Figure 45 is a photograph of a young
Text Appearing After Image:
Pig. 45. -Black knot of grape (Bacterium tumefaciens).

Note About Images