22 WORK ON THE WHITE PIXE liLlSTER RIST IX MIXXESOTA 



tield. Ill getting to Taylors Falls and camp and return, as well as to 

 the infested area at Lakeland and Pine Hollow Creek, the use of an 

 automohile 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 !5t. 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 deteniiine boun- 

 daries of an infested area the same general plans were followed, the 

 lanes being wider. In this feature of the work the bushes 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 Ribes. Later the disease in this locality was found far 

 outside of the area referred to. 



SUMMARY AND FUTURE OUTLOOK. 



L White P'ine Blister 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 above "centers" is accounted for absolutely, 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 nurser\-, 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 United States, and owners of said trees be unaware of 

 its presence. 



