. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 14 BULLETIN 360, V. S. DEPAETMEXT 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- seryed in the States of "Washington, Oreg
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 14 BULLETIN 360, V. S. DEPAETMEXT 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- seryed 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)^ refers to the excessiye 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 1 1 -P +1 ^^'^- ^^-—-^ larch branch, showing the result of a first infec- Orancnes or tne tlon at its base by Razoumofskya laricis. Ihis is the be- lower portion of the ginning of a burl at this point, which will spread to the 1 main trunk. broom, are more con- spicuous than those of other conifers (fig. 13). They sometimes attain an immense size, often including the entire crown (fig. G). In I'lij. 10.—Young, first infections of Razoitniofskija cam Tiijlopoda on western yellow pine (.Pirius po7iderosa).. 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, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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