PEACH DISEASES 307 
of the normal number, so that the next year’s crop of peaches 
will be materially lightened. Young trees suffer severely ; 
when badly diseased, they become stunted and in some cases 
are permanently injured. 
It should be stated that black-spot affects not only the fruit, 
foliage and twigs of the peach, but also these same organs of 
the apricot, nectarine and plum, making four prominent and 
important stone-fruit trees in the category of hosts for the 
black-spot pathogene. This fact adds to the economic aspect 
of this disease. Of the peaches the Elberta is particularly 
liable to extensive damage. Likewise the Champion, Carman, 
Alton and others 
are very suscep- 
tible. & . $ 
Symptoms. 
The disease is i sot 
_ 
more likely to be ; 
found on young 
Elberta trees 
than on peaches 
of other ages and 
varieties, al- 
though _ practi- 
cally all kinds are 
affected to a vary- 
ing degree. The 
leaves (Fig. 81), 
aa 
fruits and twigs i 
show symptoms Fic. 81. — Black-spot lesions on peach-leaves. 
of the disease. Note the shot-hole effect. 
On the leaves 
a shot-hole effect similar to the leaf-blight of plums and 
cherries is produced (Fig. 81). The first evidence of the 
trouble is a leaf-spot; hence the disease is at times called 
