. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 28 BULLETIN 1186, TJ. S. DEPARTMENT OF AGRICULTURE. shown on eastern white pine in Sweden and France and western white pine in Scotland. Many European foresters have been enthusiastic over the future prospects of white pine in their countries, believing that it would come to occupy an important position in their system of manage- ment and be regarded as an indigenous species. As shown by its growth abroad'it has excellent volume production, regenerates well (fig. 15), and is not exac
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 28 BULLETIN 1186, TJ. S. DEPARTMENT OF AGRICULTURE. shown on eastern white pine in Sweden and France and western white pine in Scotland. Many European foresters have been enthusiastic over the future prospects of white pine in their countries, believing that it would come to occupy an important position in their system of manage- ment and be regarded as an indigenous species. As shown by its growth abroad'it has excellent volume production, regenerates well (fig. 15), and is not exacting as to soil and moisture requirements. Such an optimistic outlook was held by foresters in Denmark, Belgium, and Norway, while the Germans had faith enough in the productive capacity of the species to plant considerable areas with white Fig. 15.—Natural white-pine reproduction in the communal forest of La Mouche, Epinal, France. In this part of the forest 36 per cent of the young trees were attacked by the blister rust, thus greatly reducing the probability of a future crop. Other foreign conifers, such as Douglas fir, Sitka spruce, and Japanese larch, will gradually replace the disappearing white pine. Himalayan and Balkan pine will also come into more extensive use for forest planting. EUROPEAN EXPERIENCE A WARNING TO AMERICA. This disease is a most dangerous forest enemy. It readily kills mature trees, but the greatest menace is in sweeping out of existence the young pine stock of to-day which is to become the mature timber of to-morrow. Although it is slow in developing, it is nevertheless constant in action and certain in destruction, undermining the very security of our forest capital, without which continued forest pro- duction is impossible. Blister-rust control is a national problem. It is necessary to pro- tect a resource so essential as white pine for economic and industrial development. Simple and practical methods are available to any pine owner in the
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