. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 2.—Outline map of the United States, showing the known distribution of Cronartium ribicola and C. occidcntale in North America to January 1, 1920. Localities for Cronartium occidentale are shown by- black squares in the Pacific coast and Roclq^ 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 bemg north of the Potomac and Ohio Rivers
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. Fig. 2.—Outline map of the United States, showing the known distribution of Cronartium ribicola and C. occidcntale in North America to January 1, 1920. Localities for Cronartium occidentale are shown by- black squares in the Pacific coast and Roclq^ 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 bemg north of the Potomac and Ohio Rivers and east of the Mississippi liiver. Four points in southwestern ilinnesota, 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 oast of the Mississippi River. The cross-liatchcd 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 wliite pines. Cronartium ribicola is limited to the eastern white-pine area and was not known in North .\merica 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 white-pine area in which piilon pines arc native, where it appears also to be native. The two fungi are separated by a strip of prairie country about 500 miles wide. Distribution of the pines furnished by the Forest Service, United States Department of Agriculture. Distribution of Cronartium occidentale furnished by Messrs. Bethel and Posey, of the OfTices of Investigations in Forest Pathology and of Blister-Rust Control, respectively. Bolschaja Inja River (131, 161); also from Tomsk and Minu
Size: 2154px × 1160px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
