Atlanta tri-weekly journal. [volume] (Atlanta, Ga.) 1920-19??, 1922-12-05
BY DR.. ANDREW M. SOULE


osition 10 the number of tWigs at
tackled.
>. Disfigurcs the trees, making the
orchard look ragged and upkept.
3. Weakens the treCS'sO that they
are easily killed by other causes.
The disease SHOWS up unmista}
ably in midsummer. There will be
a variation year to year, probably
due to the health of the tree during
the previous season, or seasons, and
climatic conditions. A close observer
can diagnose the disease during the
dormant season even or trees which
have not been severely attacked. The
disease can be seen easily during the
dormant season on trees that are
severely affected, by taking into ac-
count the form and shape of the
tWig growths. A healthy pecan tree
will have a characteristic shape and
branch formation. These character
istics vary with varieties, viz: The
Stuart variety has an upright form
and close growing branches, while
the F'rotscher variety is slightly re-
cumbent and the branches are fairly
| far apart.
When a tree has the rosette it
tends to lose this Varietal character
istic in form and shape. If the dis
ease is severe for several years, the
outermost twigs die annually, and
the growth is clustered around the
main branches. In the spring new
growths start nearer the trunk and
main branches than in normal trees.
This will give, in the course of time,
a trunk and main branches larger
IN proportion than the rest of the
tree, and characteristic clustering
of the growth four to eight feet
above the ground, which growth will
be small in expansion, and from
which will appear the dead twigs.
In the early spring when the
foliage growth is forming, the leaves
of rosetted trees will be larger and
darker in color than the leaves of
trees not diseased. Toward midsum-
ner the seasonal terminal growth
is retarded Later, shoots are pro-
duced in more than normal GUAM
titles. The leaves on these shoots
will be small, yellowish green and
sometimes rusty, often notified. This
notified appearance is due to the
fact that parts of these leaves are
thinner than other portions.
| A characteristic twig having the
rosette, bu not yet dead, might be
described as follows: The growth
from the terminal bud will be, let
us say, one foot long. If the tree
had not the rosette, this growth
would have been two and one-half
feet long. Yet approximately the
same number of lateral buds are
formed on the short growth of the
rosetted tree as would have been
formed on the longer growth of the
healthy tree. Furthermore, it seems
| that more of these lateral buds de-
velop into shoots during the sea-
son on a rosetted tree than on the
healthy one. This is probably due
to the fact that the terminal growth
has been retarded and the tree is
making natural attempt to be nor
NAL by developing as many buds as
| possible. These lateral shoots or
tWigs are small, slender and very
| much clustered. The foliage on these
! twigs is yellow and sickly in appear
ance, and owing to the large num-
Der of lateral shoots from limited
area, the terminal growth, the lat
eral shoots and the foliage are de-
| veloped into a rosette. This is how
the disease received it's name.
Trees which have had the disease
for a long time lose this rosetted
| characteristic and will contain many
dead twigs and branches. 1t is very
doubtful that trees have been ac-
tually killed by the rosette, but the
| disease is sometimes so severe as to
hinder the trees from increasing in
size.
When a tree has the rosette it
! tends to lose this varetal characteris-
! tic in form and shape. If the DIS
ease is severe for several years, the
outermost twigs die annually and
the growth is clustered around the
main branches. In the spring new
| growthS start nearer the trunk and
main branches than in normal trees.
This will give, in the course of time,
a trunk and main branches larger
in proportion than the rest of the
| tree and a characteristic clustering
| of the growth four to eight feet
above the ground, which growth will
| be small in expansion, and from
which will appear the dead twigs.
In the early spring when the To-
| liage growth is forming, the leaves
! of rosetted trees will be larger and
darker in color than the leaves of
trees not diseased. Toward midsum-
mer the seasonal terminal growth is
retarded. Later, shoots are pro-
duced in more than normal quanti-
| ties. The leaves on these shoots will
| be small, yellowish green and some.
| times rusty-often notified. This
| notified appearance is due to the
! fact that parts of these leaves are
| thinner than other portions.
A characteristic twig having the
rosette, but not yet dead, might
be described as follows: The growth
from the terminal bud will be, let
us say, one foot long. If the tree
! had not the rosette. this growth
would have been two and one-half
feet long. Yet, approximately the
same number Of lateral buds are
formed on the short growth of the ro-
setted trees as would have been
formed on the longer growth of the
healthy tree. Furthermore, it seems
| that more Of these lateral buds de-
Velop into shoots during the season
on rosetted tree than on the
healthy one. This is probably due
to the fact that the terminal growth
has been retarded and the tree is
making natural attempt to be nor
NAL by developing as many buds as
possible. These lateral shoots or
tWiss are small, slender and very
much clustered. The foliage on
these twigs is yellow and sicllly in
appearance, and, owing to the large
number of lateral shoots from
limited area, the terminal growth,
| the lateral shoots and the foliage
are developed into a rosette. This
Is how the disease received it's name.
Trees which have had the disease
FOR long time lose this rosetted
characteristic and will contain MANY
dead twigs and branches. 1t is
doubtful that trees have been ac.
tually killed by the rosette, but the
| disease is sometimes so severe as to