. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 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. »£*' ' i^i s^^H '..'». " #u 'i^HU t^iv jVCBb **&ki I »\, /4-->.^5]h| jyf^ jJH [*~~1ml- *h 'IwBiJfljR ' ⢠wk I
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 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. 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 Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration a
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