10 BULLETIN 360, U. S. DEPARTMENT OF AGRICULTURE. 
tional Forest), the following figures were assembled by Mr. T. J. 
Starker, covering a period of 28 days of cutting: 
Weesternolareh 20 226 tut). no ee ee Se ae ee eee 556 
Western yellowspine= 22-3 - eee ee 2k as Shed AAPM ned ee na 172A ll 
POUT AS ei ee gees Ss aE Se Fes eB ee eee 422 
Total! see. 2s Be ee a ee eee eee ee ies NSS) 
It must not be assumed that the death of these trees resulted 
from mistletoe. It is doubtful whether the death of even a small 
percentage of them, with 
the exception of the larch, 
can be so referred. A more 
conservative statement 
would be that mistletoe had 
a large share in their death 
by causing spiketop, the 
brooming of branches, and 
the formation of burls on 
the trunk. These are com- 
mon forms of mistletoe in- 
jury for all three species in 
this region and lead up to 
serious insect infestation, 
of which more is said later. 
That mistletoes are capable 
of actually causing the 
death of their hosts is first 
shown by their effects on 
young growth from three 
to eight years old. In a 
heavily infected but very 
open stand of yellow pine 
on the bench lands of the 
I'ic. 7.—Douglas fir killed by mistletoe. Note the Spokane River, Wash. (Pl. 
total absence of normal branches. The structure IDOL fig. Ik). an attempt was 
of the brooms is here plainly shown. Note the d A 
straight trunk of the larch in the background. It Made to ascertain the 
is uninfected by mistletoe and still retains its gqmount of injury resulting 
original branches. 5 
to the seedlings of an aver- 
age sample acre, which included in its area nine semimature and 
heavily infected trees in all stages of suppression. The acre was 
divided into plats and all young growth counted and examined as 
to infection and the condition of the infection. The number of 
seedlings and small growth below 8 feet in height totaled 480, which 
is an excellent reproduction for this region. Just a little more than 
half of this number, or 245, were found to be infected, representing 
every possible type of infection on stem and branch. It is not to be 
expected that these seedlings would ever grow up to form merchant- 
oleae a aiaaian tet aeasees 
& 
