4 
WORK OX TIIK Wlin'li IMXK mOSTKR ROST IX' MINNESOTA 
became estaljlished. It is now ( ( tctol^er, 1916) reported as occurring 
in New Jersey also. To prevent furtlier introduction of the disease into 
this country the hTderal Horticultural Board has forbidden (Mav 21, 
1913 ) the importation of all five-leaf pines. This ([uarantine super- 
seded that of September 16, 1912. It did not, however, (juarantine any 
of the above infected states from which pines had been freely shipped, 
and currants and gooseberries are still allowed to enter the United 
States from Europe and other foreign countries. The entrance of these 
canes is doubtless permitted, because it has yet to he definitely estab- 
lished that the rust s])ores pass the winter U]ion them. 
LOCALITIES IN MINNESOTA WHERE WHITE PINE 
BLISTER RUST IS KNOWN TO OCCUR. 
In May a professor in Macalester College, St. Paul, Minnesota, 
submitted to the Ex])eriinental Station, a portion of a diseased pine 
coming from his farm in Polk County, Wisconsin. This was at once 
determined by our Plant Pathologist to be White Pine Blister Rust. 
Incident to a visit in the latter part of May to St. Croix Ealls, Wiscon- 
sin, upon the part of members of the Plant Pathology Division and a 
member of the Nursery Inspection force, the disease was also found 
in a Minnesota nursery (which, to avoid personal reference we will 
designate as “Nursery A”), close to the St. Croix River, the proprietor 
of which had in the spring of 1915 obtained white pine trees at an old 
nursery in St. Croix Ealls, Wis. This last named nursery had pur- 
chased these pines in one of two shipments, or in two shipments of trees 
from (dermany, coming* thru an Illinois firm in 1908-09. 
Later, July 14th, two experts employed l)v the State Entomologist 
scouting for the disease along the banks of the St. Croix discovered 
its presence upon Ribcs in the timber at Dry Creek, about 6j4 miles 
above Taylors Ealls, a mile or more from the St. Croix River, and 
approximately four miles from the above mentioned nursery designated 
as Nursery A. Previous to this finding it had been discovered (June 
4th) bv the Nursery Inspection force in a row of large pines about 
eighteen years old in a nursery forty miles or more south of the above 
infested locality. (This nursery may be designated as “Nursery B.”) 
It was found on currants ( uredospore stage) growing 75 feet from 
these infected pine on June 20th. 
It is important to note at this ])oint a fact which will be referred to 
later that, as a result of a most careful investigation by the inspection 
force u])on ])ines in the earlv summer and later u])on pines, currants and 
goc^seherries no evidence of this disease has been found in other 
