Prematureness in ripening varies from a few days to several weeks;
the earlier it occurs, the smaller the fruit. When diseased fruit
ripens near the normal season the peaches may be full size, showy to
voluptuousness and marked outwardly only by the hectic red of the
disease. The taste indicates the disease--in insipid, mawkish or bitter
specimens which show the red color and undersize of prematured peaches.
During the first season prematured fruit may show only on particular
branches or even on a single shoot which may not differ in appearance
from other parts of the tree. Prematureness, unaccompanied by other
symptoms of yellows, may be due to borers, drought, neglect, girdling
or similar causes.
The second symptom is the opening of winter-buds out of season.
This usually occurs a year later than the appearance of prematured,
red-colored fruits. The buds may push forth shortly after they have
formed in mid-summer while the tree-top is still bearing its fruit
and foliage or they may delay until the next spring, to appear a few
days in advance of normal leafing-time. Very often these buds begin
growth in the autumn after healthy leaves have fallen. Such diseased
buds may develop on tips of branches, especially water-sprouts, but
feeble, sickly shoots due to the disease usually appear in considerable
numbers on main limbs and on the trunk, no doubt under the influence of
the yellows on old resting buds buried deep in the bark of the wood.
Sometimes these yellow shoots are unbranched but oftener they are much
branched and frequently but bunchy tufts of foliage, stems slender,
leaves pale green, small, narrow and standing out stiffly at nearly
right angles to the stems.
In the final stage of the disease the trees assume the yellowish leaves
which give name to the trouble, though sometimes the yellow is tinged
with red. Yellows is an unfortunate name since so many other troubles
of the peach cause the foliage to take on the jaundiced appearance of
this disease. The third stage marks the beginning of the end--sometimes
three years, sometimes five or six, but always death sooner or later,
there being no instance on record of a diseased tree having been cured.
This, in brief, is the usual course of yellows, but it follows no
invariable rule in its development. Yellows is known to be spread as
a contagion by affected buds in nursery stock, by nursery-trees, by
orchard-trees, and may even be communicated by pits from affected
trees. That it must be caused or transmitted in still other ways is
apparent to all who have had experience with the disease. It seems
not, however, to linger in the soil, for trees may be set in the very
spots from whence diseased plants have been removed without danger to
the newcomer. "War to the knife and the knife to the hilt"--absolute
extermination, root and branch, by ax and fire, is the only known
method of subduing yellows.
Public-domain text, read in full here on John Shaqi.
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