12 



BULLETIN 658, U. S. D] PABTMENT OF AGRICULTURE. 



the site, made at the time the nursery was contemplated, would no 

 doubt have resulted in the discovery of the same rust upon the near- 

 by lodgepole pines as well as upon the Indian paintbrush plants, and 

 future losses would have been prevented. The infection with a 

 needle fungus x of Douglas fir seedings at the Boulder nursery, Boul- 

 der, Mont., and the occurrence of a mistletoe upon the seedlings - 

 were due to these diseases being extremely prevalent upon the sur- 

 rounding native trees of this species. The young and crowded seed- 

 lings became ready hosts for the fungus, and considerable damage 

 resulted. 



- -**K 





Fig. 13. — Porbi weirii, brown-cedar poria. Fruiting surface. 



In the State nursery at Roscommon, Mich., 3 a similar proximity 

 of native infected trees and susceptible nursery stock resulted in a 

 serious epidemic. 



No less care should be taken with proposed plantation sites upon 

 burned-over or cut-over areas. A disease survey should be made 



1 Weir, J. R. A needle blight of the Douglas fir. In Jour. Agr. Research, v. 10, no. 2, 

 i . 99-103, •". Qgs. 1917. 



2 Weir. .7. It. Mistletoe Injury to conifers in the Northwest. I". S. Dept. Agr. Bui. 

 B60, p. 35. y-'U\. 



3 Kau"rnr.n, C. II.. and Mains, E. B. An epidemic o'f Cronartium comptoniae at the 

 Roscommon State Nurseries. In 17th Ann. Bpt. Mich. Acad. Sci., 1915, p. 188-189. 1916. 



