CHERRY DISEASES 
Fig. 2. Tree Showing the Serious Effects of 
the Disease on the Trunk, Crotch and Limb 
Bases, a Dangerous Condition. This is 
beni by limb-grafting upon mazzard seed- 
ings. 
where trunks and limbs are badly dis- 
eased. Old trees and younger trees seem 
to be equally affected. This trouble is 
first noticeable early in the spring when 
some of the buds, which formed normally 
in the fall, fail to swell and open when 
the others unfold. (See Fig. 3.) A drop 
783 
of gum often appears exuding from the 
bud or from the affected spurs. (See 
Fig. 4.) Sometimes affected buds unfold, 
but before the blossoms open, wilt down 
and dry up. Often, however, spurs come 
into full leaf and set fruit, only to die a 
week or two later. As far as our observa- 
tion goes, blighting of this sort does not 
usually take place during the summer or 
fall. 
The amount of damage directly pro- 
duced by this form of disease is not very 
serious in most cases, but the after effects 
are probably much more important than 
has been supposed. Investigation shows 
that after a spur or bud has been blight- 
ed, a small area of discoloration usually 
spreads out from its base onto the branch. 
This is almost always confined at first to 
the outer layers of the bark. As in the 
case of larger cankers, a layer of wound 
cork eventually separates the diseased 
tissue from the healthy substance of the 
branch. The following season, however, 
the diseased area may spread farther 
ee od 
Se 4 
Fig. 3. Cherry Branches Showing Blighted 
Spurs 
Failing to Develop at Blossoming 
Time. 
