et | 
MISTLETOE INJURY TO CONIFERS. 9) 
Taste I1.—The youngest age class of mistletoe infection on five different hosts. 
Youngest 
age at : 
Host _ which Locality where observations 
: infection were made. 
is known 
to occur. 
Years. 
Clark Fork Valley, Mont. 
Blue Mountains, Oreg. 
Priest River Valley, Idaho. 
Blue Mountains, Oreg. 
Missoula, Mont. 
Sullivan Lake, Wash. 
Spokane River, Wash. 
Blue Mountains, Oreg. 
Coeur d’ Alene, Idaho. 
Spokane River, Wash. 
Blue Mountains, Oreg. 
Coeur d’ Alene, idaho. 
Clearwater River, Idaho. 
CO WOO W OTST BE OUST 
1 Valleys of the so-called Bitterroot and Missoula Rivers. 
There is no reason why a seedling should not become infected 
during its first year if seeds should happen to be favorably located 
upon it. Seeds falling at the base of terminal buds of yellow-pine 
branches have been known to effect an entrance in the succeeding 
UU 
WITTY WAS | 
Be lS el ale 
-E CESS Rae a BAU aR 
(874 18EO | 1885 7890 E95 1900 GOS 1HO s/HP 
FEARS 
Fic. 3.—Graphs showing the average annual growth (in inches) for 40 years (1874 to 
1913, inclusive) of 80 trees of western larch heavily infected with mistletoe, com- 
pared with 80 uninfected trees of the same species for the same period. A, Heavily 
infected trees: Average-age class, 144 years; average height, 63 feet; average diam- 
eter, breast high, 11.5 inches. B, Uninfected trees: Average-age class, 144 years; 
average height, 115 feet; average diameter, breast high, 19.5 inches. 
AVERAGE ANMNCAL GROWTH, /LIVCFIES 
season’s growth within the year. All infections of firs and spruces 
have been found on trees ranging from 50 to 150 years. They 
occurred principally on the branches, resulting in large brooms, so 
that nothing could be determined as to the probable age of the hosts 
when infection took place. 
