. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 12 BULLETIN 1113, V. S. DEPARTMENT OF AGRICULTURE, DECIDUOUS OR HARDWOOD SPECIES INTRODUCED TO THE REGION. Carolina poplar.—The Carolina poplar (Populus sp.) is propa- gated by commercial nurseries and has been widelj" used in past years for shelter-belt planting on the prairies east of the northern Great Plains region. It is probably a selection of the common cottonwood taken in the central or eastern United States. Extensive tests with this variety in shelter belts on the northern Great Plains have proved it ent
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 12 BULLETIN 1113, V. S. DEPARTMENT OF AGRICULTURE, DECIDUOUS OR HARDWOOD SPECIES INTRODUCED TO THE REGION. Carolina poplar.—The Carolina poplar (Populus sp.) is propa- gated by commercial nurseries and has been widelj" used in past years for shelter-belt planting on the prairies east of the northern Great Plains region. It is probably a selection of the common cottonwood taken in the central or eastern United States. Extensive tests with this variety in shelter belts on the northern Great Plains have proved it entirely unsuited for general planting in this region. Norway poplar.—The Norway poplar {Populus sp.) is propagated extensively by commercial nurseries. It closely resembles the Caro- lina poplar. Extensive tests in shelter-belt plantings in the northern Great Plains indicate that it is unsuited for general planting in this section. Canadian poplar.—The Canadian poplar {Populus sp.) is one of several varieties imported a number of years ago from northern. Fig. 6.—Shelter-belt planting of box elder, northwest poplar, and green ash planted 6 by 6 feet at Archer, Mont., showing clean cultivation in the first year of growth. Russia or Siberia and propagated by commercial nurseries in the United States and Canada. This variety has been extensively planted in the Plains region of Canada, where it has proved quite adaptable for shelter-belt use. Plantings in the Plains region of the United States, however, have shown that it is subject to attack by canker, which kills the trees in three or four years. This disease makes it a questionable variety for general use in this region. Laurel-leaf willow.—The laurel-leaf willow {Salix pentandra) is extensively propagated by commercial nurseries for shelter-belt planting in the Northwest. It was imported a number of years ago from Europe. While it is reasonably hardy, it does not seem able to establish itself in the upland prairie locati
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