6 
WORK ON THE WHITE ITXE REISTER RUST IN MINNESOTA 
The owner of Xiirserv ]> below Stillwater, in which the disease 
has ])robably been present for more than one year, claims that he has 
bought only seed from European sources, and that his pines for the past 
ten years have been of his own raising. The row of eighteen-year- 
old trees, upon which the blister rust was first found in that locality, 
was planted there when the nursery was first established fourteen or 
sixteen years ago, and so far, those in a position to know where the 
trees came from have claimed inability to state the source. The owner 
of Nursery A at Taylors Falls, as has already been stated, unwittingly 
lirought some diseased trees from Wisconsin to his nursery in the 
spring of 1915. So far inspections of all other nurseries in this state 
have failed to disclose the rust. 
These facts, and the further fact that we have only found the dis- 
ease centers thus far along the St. Croix, in no case hardly more than 
two miles from the river and for the most part close to the river, points 
strongly to its introduction into this state from Wisconsin, and mani- 
festly whatever we may do in Minnesota towards its eradication (and 
it is not assuming to state that all has been done that could be done 
this summer with the time and money at our disposal) will be futile, 
unless Wisconsin authorities feel the gravity of the situation and do 
their part in that state. 
Toth infestations at Dry Creek and Pine Hollow Creek, as well 
as that at Nursery B, have been discovered by experts in the Nursery 
Inspection Force, employed by the State Entomologist to scout along 
the St. Croix, covering the Alinnesota side from the upper dam about 
twelve miles above Taylors Falls to Stillwater and below. 
\\hsconsin, to date, has made practically no similar survey of its 
side of the river, but has been content to give attention to eradication 
of pines, currants and gooselierries about Fake Waupagasset and to 
scouting in the region close to St. Croix Falls. On June 10th the 
Whsconsin Entomologist issued a quarantine notice, forbidding the 
entrance into that state of any five-leafed pine. 
LIFE HISTORY OF THE WHITE PINE BLISTER RUST. 
As above intimated this parasitic disease cannot pass from pine to 
pine, but must go to currant or gooseberry and back to pine. It can, 
however, pass from currant to currant or currant to gooseberry, both 
sjiecies in the genus Ribcs, or from gooseberry to gooseberry. It is 
transmitted from one host to another by means of tiny spores very 
much smaller than grains of pine pollen ( a spore being hardly visible 
to the naked eye), which can be 1)orne it is believed many miles by 
the wind. It occurs to us that other agencies which may aid in its 
