MARKING RULES FOR IDAHO AND MONTANA 681 



tention is drawn to the renioval of infected trees below and above the 

 specified diameter limits — a phase of the work heretofore receiving little 

 attention. The practical application of such rules to the various forest 

 types of the region is discussed along with methods and means of 

 enforcing them. A plea is made to have the Forest Service carry out, 

 so far as is practicable, all phases of the forest sanitation work. 



As an economic measure, pathological marking rules, if properly out- 

 lined and enforced, will eventually insure a cleaner, healthier second 

 crop, and by this means greatly reduce the loss due to decay. 



BIBLIOGRAPHY 



1. AIcHarg, C. K., Kittredge, J., and Preston, J. F. : Developments in the mark- 



ing of western white pine (Pinus nionticola) in northern Idaho. Journal 

 OF Forestry, vol. 15, November, 1917, pp. 871-885. 



2. Meinecke, E. P. : Forest pathology in forest regulation. U. S. D. A. Bui. 275, 



April, 1916, pp. 1-63. 



3. Weir, J. R. : Some factors governing the trend and practice of forest sanita- 



tion. For. Quart., vol. 13, December, 1915, pp. 481-489. 



4. Weir, J. R., and Hubert, E. E. : A study of heart-rot in western hemlock. 



U. S. D. A. Bui. 722, October, 1918, pp. 1-37. 



5. Buller, A. H. R. : Researches on fungi, 1909, pp. 1-287. 



6. Weir, J. R. : Notes on the altitudinal range of forest fungi. [Nlycologia, vol. 



10, January, 1918, pp. 4-14. 



7. W^eir, J. R., and Hubert, E. E. : A study of the rots in western white pine. 



U. S. D. A. Bui. 799, 1919- 



8. Lindau, G., in Sorauer, Handbuch der Pflanzenkrankheiten, with literature, 



vol. 2, 1908, p. 394. 



9. Weir, J. R. : Larch mistletoe: Some economic considerations of its injurious 



effects. U. S. D. A. Bui. 317, 1916, pp. 1-25. 

 ID. Hubert, E. E. : Fungi as contributory causes of windfall in the Northwest. 

 Journal of Forestry, vol. 16, May, 1918, pp. 696-714. 



11. Weir, J. R., and Hubert, E. E. : Forest disease surveys. U. S. D. A. Bui. 658, 



June, 1918, pp. 1-23. 

 Meinecke, E. P.: Forest tree diseases common in California and Nevada. 

 U. S. D. A., F. S. Manual, 1914. 



12. The National Forest Manual. Silviculture, pp. 32-S4. 



13. Marking rules for the larch-Douglas fir type. MSS. U. S. D. A., Forest 



Service, District i. May, 1916, pp. 1-13. 



14. Mason, D. T. : Utilization and management of lodgepole pine in the Rocky 



Alountains. U. S. D. A. Bui. 234, 1915, pp. 1-54. 



