. Diseases of flowers and other ornamentals. Flowers; Plant diseases. Diseases of Flowers and Other Ornamentals 25 ling plantings. These may be propagated by root sprouts. Some mil- dew-resistant, strains are advertised in garden magazines or may be developed by selection. There seems to be a tendency in delphiniums for plants resistant to mildew to be susceptible to bacterial leaf spot. Dust- ing the leaves with dry, powdered sulfur is of value in preventing mil- dew. DOUGLAS FIR, PSEUDOTSUGA TAXIFOLIA Bacterial Gall Disease.—Roundish, rough-barked swellings or galls, from the size of a pinhe
. Diseases of flowers and other ornamentals. Flowers; Plant diseases. Diseases of Flowers and Other Ornamentals 25 ling plantings. These may be propagated by root sprouts. Some mil- dew-resistant, strains are advertised in garden magazines or may be developed by selection. There seems to be a tendency in delphiniums for plants resistant to mildew to be susceptible to bacterial leaf spot. Dust- ing the leaves with dry, powdered sulfur is of value in preventing mil- dew. DOUGLAS FIR, PSEUDOTSUGA TAXIFOLIA Bacterial Gall Disease.—Roundish, rough-barked swellings or galls, from the size of a pinhead to several inches in diameter, may develop on. Fig. 8.—Bark canker of Douglas fir. the twigs, branches, and upper stems. This is due to infection with a bac- terial organism, Phytomonas pseudotsugae. Bark Canker.—Long, narrow, elliptical, dead, slightly sunken areas or cankers sometimes appear on the smooth bark, usually on the stems of young saplings (fig. 8). These cankers may be from 1 to 30 inches in length and usually develop around the stubs of dead twigs which have been killed by the fungus Phomopsis lokoyae. Small spore pustules may. 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, University of California
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Keywords: ., bo, bookcentury1900, booksubjectflowers, booksubjectplantdiseases
