‘ 
| FOREST DISEASE SURVEYS. Aa: 
_ always remains a great danger of infection spreading to the young 
_ stock, with consequent loss. This has been shown in several recent 
g cases where forest nurseries were located in close proximity to dis- 
_ eased trees and alternate hosts. At the forest nursery at Haugan, 
Fic. 12.—Fomes officinalis, chalk fungus, showing typical rot in lodgepole pine. Note the 
‘ white mycelium in the cracks. (Photographed by G. G. Hedgcock.) 
“Mont., yellow-pine seedlings became seriously infected with Cronar- 
| tium coleosporioides (Peridermium filamentosum Pk.). The disease 
was transmitted by means of the alternate form of the rust occurring 
on the Indian paintbrush (Castilleja miniata Dougl.), which was 
found growing at the very edge of the nursery beds.t. A survey of 
1 Weir, J. R., and Hubert, E. E. A serious disease in forest nurseries caused by Peri- 
<a filamentosum. Jn Jour. Agr. Research, v. 5, no. 17, p. 781-785. 1916. 
