. California plant diseases. Plant diseases. 1114 UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION. Crown Gall. Figure 43. The seedlings of some species frequently develop gall-like swellings on the stem near the surface of the ground. This condition does not seem to be particularly injurious. Cause unknown. Possibly a normal condition. GRApE Mildew (Uncinula spiralis). Figure 44. A white powdery mildew on the leaves and fruit clusters. Dust thoroughly with flowers of sulphur in moist weather before the fungus develops extensively. See Bulletin 186, California Experiment. Fig. 44.—Powdery mildew of
. California plant diseases. Plant diseases. 1114 UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION. Crown Gall. Figure 43. The seedlings of some species frequently develop gall-like swellings on the stem near the surface of the ground. This condition does not seem to be particularly injurious. Cause unknown. Possibly a normal condition. GRApE Mildew (Uncinula spiralis). Figure 44. A white powdery mildew on the leaves and fruit clusters. Dust thoroughly with flowers of sulphur in moist weather before the fungus develops extensively. See Bulletin 186, California Experiment. Fig. 44.—Powdery mildew of grape (Uncinula spiralis). Station. On account of the importance of this disease, we quote as follows from California Experiment Station Bulletin 197: '' The most common mistake of those who have attempted to follow the directions of the bulletin (186) has been a failure to treat the vines thoroughly or rapidly enough in the beginning of the season. It can not be too strongly urged that the most effective way to control the mildew is by a thorough and effective sulfuring in the beginning of the season. This alone will in most parts of the State keep the vines free,.. 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; Smith, Elizabeth H. (Elizabeth Hight), 1877-1933. Berkeley, Cal. : Agricultural Experiment Station
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