8 
The Colorado Experiment Station. 
tage, it seems very probable from observations of the season that 
sooner or later blight will get into the trunk and kill the tree. 
So often does this seem to be true in the case of the Idaho that it 
would seem advisable to discourage the working over of this var¬ 
iety. Some of the commercial varieties which seem to be most 
free from blight are Keiffer, Anjou, Mt. Vernon, Garber, Howell 
and Seckel. Ee Conte, Sugar, Bose and Sudduth, four varieties 
not so well known, seem to be quite free from blight. Unfortun¬ 
ately when once attacked, Bartlett seems to suffer quite severely. 
Winter Nelis is fairly resistant, while Clairgeau seems to suff er 
severely from attacks in the trunk and larger branches. Persis¬ 
tent cutting out, I think, will do much to save the pear orchards. 
If it does not pay to cut out the blight, it does not pay to grow 
pears and owners of badly infested orchards should pull them out. 
Many growers pronounce their pear orchards the most profitable 
piece of land on the ranch, but these are men who cut out 
the blight. The general practice with these men is to cut out blight 
at least three times during the summer. 
Blossom and twig blight in the apple seems to be on the in¬ 
crease and has attracted a great deal of attention the past sea¬ 
son. It has not only caused a loss of crop, but a great deal of 
anxiety in regard to the future of the trees attacked. However, 
the only loss seems to be in the destruction of the crop before it 
has set, and the killing of whole fruit spurs carrying blighted blos¬ 
soms. Only in a few sweet apples and in very severe cases has 
the blight done any damage to larger limbs. The general tendency 
seems to be for the blight to kill the spur back to the branch 
from which it springs and then die out. In especially bad cases 
in Tolman Sweet we have found branches of one and two year 
old wood killed. Even where the fruit spur is hardly more than 
a bud, it seems to be an exception for blight to do any damage to 
the branch from which it springs. 
There seems to be some difference in varieties as to their re¬ 
sistance to blossom blight. All the sweet apples blight badly. 
The Ralls, Dr. Walker, Wealthy, Pewaukee and Jonathan are also 
subject to severe attacks. No varieties seem to be immune in 
badly infected orchards, but the Winesap, Gano and Ben Davis are 
as resistant as any. However it seems hardly possible to give 
definite lists, for there are exceptions, and the tables are often turned. 
“Twig blight'' is also bad in some varieties, as the sweet 
apples, Jonathan, Pewaukee, Red Romanite, Willow Twig and 
Transcendent Crab. In this case the blight rarely affects more 
than the current season’s growth. Badly blighted pear trees 
neglected by the owner of the orchard or a nearby neighbor were 
often found to be the original source of infection in these badly 
blighted orchards. With more careful cutting out of pear blight, 
