. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. BULLETIN No. 799 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER November 10,1919 A STUDY OF THE ROTS OF WESTERN WHITE PINE. By James R. Weir, Forest Pathologist, and Ernest E. Hubert, Scientific As- sistant, Office of Investigations in Forest Pathology, Bureau of Plant Industry, Missoula, Mont. CONTENTS. Losses due to fungi Local pathology of western white pine- Field studies of the rots in western white pine Relation between
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. BULLETIN No. 799 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER November 10,1919 A STUDY OF THE ROTS OF WESTERN WHITE PINE. By James R. Weir, Forest Pathologist, and Ernest E. Hubert, Scientific As- sistant, Office of Investigations in Forest Pathology, Bureau of Plant Industry, Missoula, Mont. CONTENTS. Losses due to fungi Local pathology of western white pine- Field studies of the rots in western white pine Relation between rot and various fac- tors Age Size , Page. 1 2 Page. Relation between rot and various fac- tors—Continued. Infection age 11 Injuries , 13 Sporophores 15 Discussion of results 19 Methods of control 22 Summary 23 LOSSES DUE TO FUNGI. The estimated stand of western white pine (Pinus monticola) in British Columbia, Oregon, Washington, Idaho, and Montana is about 23,685 million feet B. M., valued at approximately $102,875,000. The average loss due to the activities of fungi in western white pine for the entire white-pine belt, based on data from logging operations in northern Idaho, is 1,658 million feet B. This figure, on a basis of the above given valuation, shows a loss of $7,201,250 from this cause alone. These figures, taken as an average condition throughout the merchantable range of the species, indicate the loss from decay to be enormous. The limited area occupied by merchantable white pine, the adaptability of its wood to a wide range of uses, and the ease with which it is worked so establish its value as a timber tree that it becomes imperative to investigate any ;ause of financial loss in the species, the amount of this loss, the 1 Based on the recorded data, which give as the average rot percentage for the entire area upon which the data were collected. The actual loss due to rot would no doubt be greater if figured on a basis of cull percentage or actual volu
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