. The dry-rot of incense cedar . J^P^Lft. Washington, D. C. PROFESSIONAL PAPER November 10, 1920 THE DRY-ROT OF INCENSE CEDAR. By J. S. Boyce, Assistant Pathologist, Office of Investigations in Forest Pathology. CONTENTS. Page. Importance of incense cedar 1 Total-loss factors 2 Method of collecting data 4 Secondary rots 7 The dry-rot 8 Page. Application of results 49 Relative importance of dry-rot 49 Control of dry-rot 49 Summary 55 Literature cited 57 IMPORTANCE OF INCENSE CEDAR. Incense cedar (Libocedrus decurrens) is of considerable economic importance on the Pacific coast. The available su
. The dry-rot of incense cedar . J^P^Lft. Washington, D. C. PROFESSIONAL PAPER November 10, 1920 THE DRY-ROT OF INCENSE CEDAR. By J. S. Boyce, Assistant Pathologist, Office of Investigations in Forest Pathology. CONTENTS. Page. Importance of incense cedar 1 Total-loss factors 2 Method of collecting data 4 Secondary rots 7 The dry-rot 8 Page. Application of results 49 Relative importance of dry-rot 49 Control of dry-rot 49 Summary 55 Literature cited 57 IMPORTANCE OF INCENSE CEDAR. Incense cedar (Libocedrus decurrens) is of considerable economic importance on the Pacific coast. The available supply of this species, which never occurs alone but always in mixture, chiefly with yellow pine, Jeffrey pine, sugar pine, Douglas fir, and white fir, averaging about 8 per cent of the stand, although often forming as high as 30 to 50 per cent, is estimated at 11 billion feet, 10 billion of which occurs in California (17, pp. 9-10).* That the wood is very valuable for special purposes on account of certain qualities has been clearly pointed out by Mitchell (17, pp. 2-9) recently and was mentioned by Von Schrenk (26, p. 69) 20 years ago. However, in spite of the well- known value of the wood, only about 30 million feet is cut annually in California. The stunipage rate is low and the price for the finished product often little more than pays the cost of logging and manufac- ture, according to Mitchell (17, p. 6). The reason for this is obvious. The heartwood of incense cedar is commonly rendered totally worthless by the so-called dry-rot caused by Polyporus amarus. An idea of the quantity of timber rendered unmerchantable by this dry-rot may be obtained from Mitchell's statement (17, p. 3) that so common is this defect that it is the usual practice to cut estimates of this species from 30 to 50 per cent on ac- 1 The serial numbers in parentheses refer to " Literature cited " at the end of the bulletin. 182803°—20—Bull. 871 1
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