since the blister rust may infect all species of five-needled 

 pines, and since some of these are grown ornamentally, a 

 list of all of these pines is appended, as shown in Parmer's 

 Bulletin No. 742 United States Department of Agriculture. 

 This bulletin is illustrated and gives detailed descriptions 

 of the disease, and the early history of its occurrence in 

 this country. More recent information on the control of 

 the disease can be obtained from the State Forester. 



The White Pine Blister Rust has already gained such 

 a hold in the eastern part of the United States, that its 

 elimination from generally infected states is out of the 

 question. It is here simply a matter of local control by 

 eradication of Ribes. 



All efforts are now being made to hold it there, and 

 to prevent its introduction into the extensive five-needled 

 pine forests of the Rocky Mountain and Pacific Coast States, 

 where on account of the larger number of native Ribes and 

 five-needled pines, its possibilities for damage are almost 

 incalculable. On the National Forests alone, it might 

 necessitate the elimination of the very species of the greatest 

 economic importance and most desirable in the practice of 

 forestry in that region. The disease is not present west of 

 Minnesota and cannot spread naturally across tiie treeless 

 Great Plains region. It can only reach the Far West on 

 shipments of diseased nursery stock and hence the Federal 

 Government has prohibited the movement of White Pine 

 and Ribes from states east of the Mississippi Valley quaran- 

 tine line to points west of the line. This quarantine of all 

 pines and Ribes must be rigidly enforced and it is to the in- 

 terest of all to help maintain it effectively. 



The scientific and popular names of the 5-needle pines of the 

 world, exclusive of the different varieties, are here given for the con- 

 venience of nurserymen and others vtrho may wish definite technical 

 information; American. — Pinus strobus, white pine; P. monticola, 

 western white pine, P. lambertiana, sugar pine; P. flexilis, limber pine; 

 P. albicaulis, white-bark pine; P. strobiformis, Mexican white pine; 

 P. balfouriana, foxtail pine; P. aristata, bristle-cone pine; P. cem- 

 broides, pinion pine. Foreign. — Pinus excelsa, Himalayan white pine; 

 P. pence, Balkan pine; P. armandi, Chinese white pine; P. parviflora, 

 Japanese white pine; P. cerabra, stone pine; P. koriensis, Korean 

 pine. Some of the more important varieties which are included in the 

 foregoing species are Pinus nepalensis, P. scipioniformis, P. mas- 

 tersiana, P. pentaphylea, P. morrisonicola, P. formosana, P. pumila, 

 P. mandschurica, P. sibirica, and P. coronans. 

 Alfred, Me., 13 August, 1921. 



78 



