. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. I. Fig. 15.—Celery blight caused by a species of Septoria on stalks. somewhat similar disease called "early blight" (caused by Cercospora apii), which is much less important. To prevent blight, celery must be sprayed repeatedly with 5-5-50 bor- deaux mixture (p. 100) beginning in the seedbed. In places where condi- tions are very favorable to the disease, it may be necessary to spray once a week. Spraying in the seedbed and early in the season is especially important to keep b
. Diseases of truck crops / Ralph E. Smith. Plant diseases; Plant parasites; Vegetables; Agricultural pests. I. Fig. 15.—Celery blight caused by a species of Septoria on stalks. somewhat similar disease called "early blight" (caused by Cercospora apii), which is much less important. To prevent blight, celery must be sprayed repeatedly with 5-5-50 bor- deaux mixture (p. 100) beginning in the seedbed. In places where condi- tions are very favorable to the disease, it may be necessary to spray once a week. Spraying in the seedbed and early in the season is especially important to keep blight from getting started. In spraying celery, the matter of spray residue must be kept in mind, for there is much prejudice at present against anything which looks like chemical spray materials on articles used for food. On this account it is desirable for celery growers in any given district to learn by experiment the minimum amount of spraying needed to control blight and also to determine the least amount of lime which may safely be used in the mixture. Dusting with a dry copper-lime dust (p. 102) is also practiced some- ** For further information and illustrations see: Rogers, S. S. The late blight of celery. California Agr. Exp. Sta. Bui. 208:83-115. 17 figs. 1911. (Out of print.). 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, Univ. of Calif.
Size: 811px × 3082px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectagriculturalpests, booksubjectplantd
