Control of Cherry Leaf-Spot Page: 4
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Farmers' Bulletin 1053.
In mild cases only a few leaves may be injured, but frequently
infections are so numerous that the tree is defoliated by midsummer.
In such cases growth is interfered with and the tree becomes stunted
and may be killed if defoliated through successive seasons or if
otherwise in poor condition. A tree severely attacked in the early
spring usually fails to ma-
- ture its fruit, which may
continue to hang on the
.' tree in a semimature condi-
'r tion throughout the season.
, -. . . . .r+ (See fig. 1.)
SCherry leaf-spot occurs
, . ', ; r' quite generally over the
4, -0 i, = * " U eastern half of the United
';" YC States and has been re-
, ported as very destructive
S in Illinois, Iowa, Nebraska,
' Michigan, Connecticut, New
f ,i A : York, and New Jersey.
DESCRIPTION OF
THE LEAF-SPOT.
:. -Upon the affected leaves
S. the disease first appears as
small purplish spots, which
later turn brown (figs. 2 and
3). These spots are usually
circular, but several may
coalesce to form a more or
less irregular area (fig. 3).
FIG. 2.-Leaf-spot on the sweet cherry. After the spots have ceased
to increase in size, the for-
mation of corky tissue between the relatively healthy adjacent
tissue and the diseased spot may cause the affected areas to drop
out, giving to the leaf the so-called "shot-hole " effect (fig. 4).
Badly infected leaves turn yellow and fall. In severe cases the tree
may be defoliated very early in the summer, since infections may
occur throughout the growing period. Infections may occur also
upon the stems of the fruits, but as these are usually found only in
the case of fruits which, owing to defoliation caused by the disease,
have continued to hang on the tree in an immature state long after
their season, they are ordinarily of little importance.
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Roberts, John W. (John William), 1882- & Pierce, Leslie. Control of Cherry Leaf-Spot, pamphlet, 1937; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc85887/m1/4/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.