. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. WHITE-PINE BLISTER RUST. 5 found much earlier, and more of it would have been found since then. Fischer (40) found the disease in 1915 spreading into western and northern Switzerland from without. It is generally supposed that Pinus cembra (26, 70, 93, 97, 98, 123) is the original pine host of this fungus. Figure 1 shows the distri- bution of P. cembra and its variety pumila in Europe and Asia. Cronartium ribicola is reported from Asia as follows: In 1879, from. Fig. 2.—Outline map o
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. WHITE-PINE BLISTER RUST. 5 found much earlier, and more of it would have been found since then. Fischer (40) found the disease in 1915 spreading into western and northern Switzerland from without. It is generally supposed that Pinus cembra (26, 70, 93, 97, 98, 123) is the original pine host of this fungus. Figure 1 shows the distri- bution of P. cembra and its variety pumila in Europe and Asia. Cronartium ribicola is reported from Asia as follows: In 1879, from. Fig. 2.—Outline map of the United States, showing the known distribution of Cronartium ribicola and C. occidentale in North America to January 1,1920. Localities for Cronartium occidental are shown by black squares in the Pacific coast and Rocky Mountian regions, the easternmost point being in western Kansas. This is where it was found in 1892, but it has not been seen there since. Localities for C. ribicola are indicated by double cross hatching and black dots, nearly all being north of the Potomac and Ohio Rivers and east of the Mississippi River. Four points in southwestern Minnesota, eastern South Dakota, and northern Iowa were found to be due to diseased nursery stock which was shipped in. It is believed that the disease now has been eradicated in these outer western localities. The natural distribution of the eastern white pine is shown in the large cross-hatched area mostly east of the Mississippi River. The cross-hatched areas shown on the western half of the map indicate the known distribution of the western white pines. The pinon pines range as far north as southern Idaho but at altitudes different from those of the white pines. Cronartium ribicola is limited to the eastern white-pine area and was not known in North America until 1906. In most places where now found it has been traced to diseased imported white-pine stock. Cronartium occidentale is limited to that part of the western wh
Size: 1968px × 1270px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1913
