WORK ON tup: wiiitp: rinp: im.lsti^r rust in m i n niusota 
15 
field. In getting to Taylors Falls and camp and return, as well as to 
the infested area at Lakeland and Pine Flollow Creek, the use of an 
automobile was found most advantageous. 
It must not be concluded from the findings of the men this year 
that infestation does not exist in other localities on the St. Croix, for 
the hosts of currants and gooseberries along the river make it easily 
possible for infestation to be overlooked. Faithful survey work in 
this region for several years is necessary. 
In eradication work the plan which appeared to give the best results 
consisted in running parallel lines thru the infested area some feet 
apart, said lines indicated by blazes or other marks. In these narrow 
lanes workmen uprooted all Ribes, placing the plants in piles for burn- 
ing. Their work was closely followed by those in charge in an efifort to 
see that no plant was overlooked. In a survey also to determine boun- 
daries of an infested area the same general plans were followed, the 
lanes being wider. In this feature of the work the 1)ushes were placed 
in piles by the workmen and then carefully examined by experts in 
charge. The evident limits of an infested area being found (Dry 
Creek Camp referred to), a “quarantine” area was outlined, including 
the infected area and nearly or quite 1,500 feet beyond the limits of 
infestation as found. At Dry Creek this included over 300 acres and 
it was over this acreage that the men attempted most faithfully to 
exterminate Ril)es. Later the disease in this locality was found far 
outside of the area referred to. 
SUMMARY AND FUTURE OUTLOOK. 
1. White Pine P)lister Rust is present in Minnesota, and has been 
found near our eastern boundary on pine and species of the genus 
Ribes. There have been discovered four points of infestation along the 
St. Croix River. Possibly, and probably, another year’s survey will 
disclose other infested localities in the same region, i. e., along the 
river. One of the aljove “centers” is accounted for al)Solutely, dis- 
eased trees having been brought in from Wisconsin. With the excep- 
tion of one or two leads from Nursery A (trees destroyed before blis- 
ters appeared) this rust has not been found in this state west of the 
Mississippi River. A careful inspection this year failed to disclose it in 
any Minnesota nursery, excepting Nursery A, and Nursery B (see 
above). It is to be noted that since it may not appear on the surface 
of a pine for some years after infection, it may be present on trees 
introduced directly or indirectly from Europe, or from some infected 
nursery in the Lhiited States, and owners of said trees be unaware of 
its presence. 
