. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 24 BULLETIN 1186, U. S. DEPARTMENT OF AGRICULTURE. During the wet summer of 1917 (0, p. 24) the blister rust de- veloped so heavily and so seriously on cultivated black currants in England that nurserymen became alarmed and feared a decided setback to their currant crop because of defoliation of the A climatic condition favorable to the spread of the rust on the currants results in an increased amount of pine infection. French. Fig. 13.—Limber pine (Pinus flexilis) growing
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 24 BULLETIN 1186, U. S. DEPARTMENT OF AGRICULTURE. During the wet summer of 1917 (0, p. 24) the blister rust de- veloped so heavily and so seriously on cultivated black currants in England that nurserymen became alarmed and feared a decided setback to their currant crop because of defoliation of the A climatic condition favorable to the spread of the rust on the currants results in an increased amount of pine infection. French. Fig. 13.—Limber pine (Pinus flexilis) growing in a nursery at Alnarp, Sweden. Blister rust first appeared here in 1920, at which time 100 seedlings 6 years old were de- stroyed. The young trees were growing within 300 feet of black currants and goose- berries. This shows the results that may be expected from an exposure of this species to the white-pine blister rust. foresters maintain that the disease is much more abundant during a wet year than in a dry A similar opinion is upheld by members of the Belgian forest service. In the western United States the two factors of an abundance of wild currants and goose- berries and a climatic condition favorable to the fungus will work together to the detriment of the five-needle pines. European cli- 14 Notes obtained from Kew Garden Laboratory, through the courtesy of Dr. A. Cotton. 15 Oral statement to the writer, 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 United States. Dept. of Agriculture. [Washington : U. S. Dept. of Agriculture]
Size: 1487px × 1680px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1913
