File:Bulletins on forest pathology - from Bulletin U.S.D.A., Washington, D.C., 1913-1925 (1913) (20316852908).jpg

Title: (Bulletins on forest pathology : from Bulletin U.S.D.A., Washington, D.C., 1913-1925)
Identifier: bulletinsonfores00unit (find matches)
Year: 1913 (1910s)
Authors: United States. Dept. of Agriculture
Subjects: Trees; Plant diseases
Publisher: (Washington : U. S. Dept. of Agriculture)
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
16 BULLETIN 360, U. S. DEPARTMENT OF AGRICULTURE. The brooming of the branches of the lodgepole pine by mistletoe is as characteristic as for the other hosts mentioned. Frequently the entire tree is involved, but more often only the lower branches. A few instances h-ave been noted where the parasite hung in long festoons from the sev- eral infected branches
Text Appearing After Image:
ȣ*' ' i^i s^^H '..'». " #u 'i^HU t^iv jVCBb **&ki I »\, /4-->.^5)h; jyf^ jJH (*~~1ml- *h 'IwBiJfljR ' ⢠wk I ^ â i m\ 1' Jffi Fig. 13.âTypical broom of the weeping-willow type on Doug- las fir caused by Razoumofskya douglasii. Note the long, flowing branches. Sometimes these branches are 8 to 10 feet long. without any particular hypertrophy of the branch as a whole. This condition is more apt to occur in dense stands. Observations by the writer on Picea engelmanni, P. mariana, Abies grand'is, A. lasiocarpa, A. concolor, A. magnified, Tsuga heterophylla, T. merten- siana, Pinus monticola, P. albicaulis, P. fiexi- lis, P. attenuata, and other conifers show that brooming of the branches is a common phe- nomenon attending mistletoe infection of these species. The weight of these brooms on many coni- fers is frequently sufficient under stress of winds and rain to cause the branches to split from the trunk, or to break farther out if the brooms are located far out from the trunk. This very commonly occurs in the case of Fig. 14.âTypical brooms of old infections on western larch caused by Razoumofskya lari- cis. Very few of the origi- nal branches remain, and they are heavily broomed and covered with lichens. The old branches are replaced by short scrubby secondary branches. Note that two of the original branches still re- main, but are dead.

Note About Images