272 MANUAL OF FRUIT DISEASES 
the set of fruit; (2) twigs may be blighted, thus inflicting 
serious injury on the tree; (3) large limbs may be cankered, 
which form of the trouble is of great importance in parts 
of New York State; (4) the crop of fruit itself may be par- 
tially or wholly destroyed as a result of attacks by the 
brown-rot pathogene; green fruits, if injured by insects or hail, 
may be rotted extensively; and likewise ripe fruits on the tree, 
in transit, or in 
market may be 
wholly ruinedasa 
result of rotting. 
Symptoms. 
The fruits are 
most commonly 
affected (Fig. 71). 
However, other 
organs of the 
host are also sus- 
ceptible to the 
disease ; these in- 
clude the blos- 
soms, twigs, limbs 
(Figs. 72 and 73) 
and occasionally 
the leaves. 
; In America the 
Tig. 72. — Brown-rot canker of peach, general flowers 
appearance in the orchard. owers are com- 
monly affected, 
resulting in a serious blossom-blight. When the blossoms are 
opened, the petals turn brown and shrivel, but do not fall. Gray- 
ish tufts composed of the fruiting structures of the pathogene 
show on the affected blossoms. Twig-blight follows blossom- 
blight very closely, the former being a direct result of the latter. 
The leaves on such twigs wither and die and cling to the twig, 
