. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 14 BULLETIN 360, U. S. DEPARTMENT OF (fig. 12). but the stimulus to abnormal branching may continue. Brooms are formed on all hosts attacked by this genus of mistletoe. Those of the yellow pine, owing to their loosely branched con- dition (fig. 12), are sometimes not as con- spicuous as those pro- duced on Douglas fir (figs. 6, 7, and 13), larch (fig. 14), hem- lock (fig. 9), or lodge- pole pine. In all the regions where the yellow-pine mistletoe has been ob- served in
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 14 BULLETIN 360, U. S. DEPARTMENT OF (fig. 12). but the stimulus to abnormal branching may continue. Brooms are formed on all hosts attacked by this genus of mistletoe. Those of the yellow pine, owing to their loosely branched con- dition (fig. 12), are sometimes not as con- spicuous as those pro- duced on Douglas fir (figs. 6, 7, and 13), larch (fig. 14), hem- lock (fig. 9), or lodge- pole pine. In all the regions where the yellow-pine mistletoe has been ob- served in the States of Washington, Oregon, Idaho, Montana, and South Dakota, broom- ing is a common result of the growth of the parasite on this tree. Correspondents in Wy- oming, Utah, and Colorado report that old infected trees are seldom without them. MacDougal (8)1 refers to the excessive brooming of yellow pine by mis- tletoe in the South- west. Meinecke (10) refers to the very conspicuous brooms on Jeffrey pine, sugar pine, yellow pine, lodgepole pine, and Douglas fir. The old brooms of the Douglas fir, be- cause of the long, trailing, willowlike branches of the lower portion of the broom, are more con- spicuous than those attain an immense size, often including the entire crown (fig. 6). In Fig. 10.—Young, first infections of RazoumofsJcya cam ptjlopoda on western yellow pine (Pinus pondcrosa).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington : U. S. Dept. of Agriculture]
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