. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WHITE-PINE BLISTER KUST. 81 with other species, (6) by the judicious selection of planting sites for pines, and (7) by such minor methods as spraying, close pasturing of Ribes, and the removal of the diseased plants or parts of them. QUARANTINE. In North America (131, p. o4-oo), Canada took the first official action against the white-pine blister rust, placing it on her list of proscribed plant diseases and later prohibiting the entry of all 5-leaved pines from all other countries. Since then (2) a quar- antine has bee
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. WHITE-PINE BLISTER KUST. 81 with other species, (6) by the judicious selection of planting sites for pines, and (7) by such minor methods as spraying, close pasturing of Ribes, and the removal of the diseased plants or parts of them. QUARANTINE. In North America (131, p. o4-oo), Canada took the first official action against the white-pine blister rust, placing it on her list of proscribed plant diseases and later prohibiting the entry of all 5-leaved pines from all other countries. Since then (2) a quar- antine has been de- clared against the shipment of Ribes from points east of a line between Saskat- chewan and Alberta to points west of that line. The shipment of Ribes to points west of this line is allowed from points in the United States south of the above protected area. These modifications are made to help protect the western white-pine area from the shipment of this disease in nursery stock,and to connect wath the Mississippi Valley quarantine line in the United States, which has been established. Fig. 13.—Outline map of North America, showing the quarantine lines established by the United States Department of Agriculture to control the white-pine blister rust by prohibiting the shipment of the host plants from infected territory to uninfectod sections. The quarantine line estabUshcd by Canada to prevent the shipment of diseased nursery stock across the prairie region from the eastern Provinces is also shown. with this end in view (fig. 13). The United States Government in 1912 (94) put in force a regulatory act controlling the entry and movement of nursery stock. This act prohibits the entry of 5-leaved pines and of Ribes from Europe, Asia, and Canada; forbids the shipment of such stock from the eastern section of the country to points west of the western boundaries of the States of Minnesota, Iowa, Missouri. Arkansas, and Louisiana; and also forbids the 46103°—21—Bull. 957 6.
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