abstracts: plant pathologi 243 



tions that the barberry may be the aecidial host in Europe have not 

 been substantiated. For this reason and because of many other more 

 or less distinctive characteristics of this rust the writer favors the use 

 of the specific name Puccinia Phlei-pratensis Erikss and Henn. 



The rust mycelium survives the winter at the Arlington Experimental 

 Farm, producing fresh uredospores in the spring. Its distribution is 

 undoubtedly due to dissemination of the uredospore by the usual 

 agencies, namely, insects, birds, man, other animals, surface winds and 

 upper air currents. Its further distribution is to be expected. 



The resistance of varieties of timothy to rust varies greatly. Depend- 

 able data on this point can be secured only under epidemic conditions. 

 Breeding of rust-resistant varieties of timothy is the only known method 

 of preventing the disease. This may not be as difficult as it appears at 

 first as timothies thus far have not been highly bred. Varietal differ- 

 ences and variations, therefore, are many, giving promise of market 1 

 response to selection. E. C. J. 



PLANT PATHOLOGY.— The blister rust of white pine. Perley 

 Spaulding, Bureau of Plant Industry, Bulletin 206. Pp. 88. July 

 22, 1911. 

 As a result of the active and increasing reforestation movement in 

 the northeastern States, white pine nursery stock has been imported 

 from Europe in considerable quantities for a number of years. Small 

 quantities of such stock have been imported for a much longer time. 

 The white pine is attacked in Europe by the fungus Peridermium strobi, 

 which is its most serious enemy in Europe, causing very serious loss in 

 nurseries and young plantations. The fungus is widely spread in Europe 

 and has been proved to be one stage of Cronartium ribicola, which 

 occurs on currant and gooseberry leaves. The disease also has attacked 

 Pinus cembra, P. lambertiana, and P. monticola. It also probably has 

 attacked P. excelsa. Early in 1909 it was discovered that this disease 

 had been imported extensively into the northeastern States upon young 

 white pine seedlings imported from Germany. Nearly all of the dis- 

 eased stock has been sent to this country by a single nursery, namely, 

 J. Heins Sons of Halstenbek. As soon as the presence of this disease 

 was known, the various State officials met and agreed to endeavor to 

 prevent it from obtaining a foothold in this country. This has involved 

 repeated inspections of the plantations of diseased white pines and the 

 removal of the species of Ribes in the neighborhood of these plantations. 

 Up to the present time the disease is not known to have become estab- 

 lished here. Owing to the great danger from importations of white 



