tts 
~— es ae 
12 BULLETIN 658, U. S. DEPARTMENT 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* 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. 
Fig. 13.—Poria weirii, brown-cedar poria. Fruiting surface. 
In the State nursery at Roscommon, Mich.,? 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 
1Weir, J. R. A needle blight of the Douglas fir. Jn Jour. Agr. Research, y. 10, no. 2, 
p. 99-103, 3 figs. . 1917. 
2 Weir, J. R. Mistletoe injury to conifers in the Northwest. U. S. Dept. Agr. Bul. 
360, p.-35. 1916. 
3 Kautman, C. H., and Mains, E. B. An epidemic of Cronartium comptoniae at the 
Roscommon State Nurseries. In 17th Ann. Rpt. Mich. Acad. Sci., 1915, p. 188-189. 1916. 
