. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. jyj^-^j'u I BULLETIN No. 317 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER • January 20, 1916 LARCH MISTLETOE: SOME ECONOMIC CONSIDER ATIONS OF ITS INJURIOUS By James R. Weir, Forest Pathologist, Office of Investigations in Forest Pathology, CONTENTS. Page. Introduction 1 The larch mistletoe 3 The forest 3 Physical and climatic features of-the forest region 5 Fungous enemies of the larch It Page. The effects of mis
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. jyj^-^j'u I BULLETIN No. 317 Contribution from the Bureau of Plant Industry WM. A. TAYLOR, Chief. Washington, D. C. PROFESSIONAL PAPER • January 20, 1916 LARCH MISTLETOE: SOME ECONOMIC CONSIDER ATIONS OF ITS INJURIOUS By James R. Weir, Forest Pathologist, Office of Investigations in Forest Pathology, CONTENTS. Page. Introduction 1 The larch mistletoe 3 The forest 3 Physical and climatic features of-the forest region 5 Fungous enemies of the larch It Page. The effects of mistletoe on its host— 12 Effect of mistletoe burls on the mer- chantability of larch trees 22 Method of control 23 Conclusions 24 INTRODUCTION. During the past four years, in connection with other pathological problems in the forest, the writer has made an extensive survey of the damage to forest growth by some of the mistletoes of coniferous trees. These parasites are yqyj widely distributed in the forest regions of the Northwest, and occur in such abundance in many localities as to assume a very serious aspect in relation to many forest problems. The extent and nature of the injury done vary greatly with the forest type, the topography, and, in some respects, with the cjimate. This is well shown in the regions in which investi- gations are now being conducted. In the dense part of many forest regions, as in the vicinity of the great lakes of Idaho, mistletoe does but little damage. However, in the more open stands bordering on the lakes or along the edge of the valleys of the Priest and Pend Oreille Rivers mistletoe occurs so abundantly on the various conifers as to interfere seriousty with the development of some of the more valuable timber trees. About the shores of Lake Coeur d'Alene, 1 The writer wishes to express his thanks to Mr. J. F. Pernot, without whose assistance the analysis of the trees would ha\e been difficult, and to Mr. E. E. Hubert for assistance in the ta
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