The Marietta journal. [volume] (Marietta, Ga.) 1866-1909, 1900-05-17

badly affected with leaf-cllrl for the past
two years.
PLAN OF EXPERIMENT.
Row lon Jan. Is sprayed with blue
stone ct tho rate of 2 pounds dissolved
III 80 gallons of water. Nothing more
was done to this row.
Result-Examined ON April t9-trees
IN fruit and nearly full leaf; 40 per cent
OF tho leaves affected with leaf curl. Re-
suit unsatisfactory.
Row 2-On Jan. IS sprayed with blue
stone as in row l, and second applica-
ton OF the same substance was made on
March ~, that is, just before the tree
came into blossom.
Result-Examined April 19-in fruit
and nearly full leaf; 1216per cent of the
leaves affected with leaf curl. Better
than No. /, but still unsatisfactory.
Row 3-The same as No. Q and the
same result up to April 10. The expert
ment is continued by the application of
weak Bordeaux g pounds bluestone, 6
pounds fresh lime and 80 gallons water)
ON April "a, when the trees were in
fruit and nearly full leaf. Final results
cannot be determined yet
Row 1.-The same as No. 3, with an ad.
ditional application of weak Bordeaux to
be made later.
Row 5-Check. This row was left I'M
treated, with which to compare results Of
| treated trees.
Result-Examined on April 10, in fruit
and nearly full leaf. Eighty per cent Of
the leaves are affected with leaf-curl
The trees look sickly and the leaves have
pale, yellowish appearance
Row Con Jan. IS sprayed with
strong Bordeaux C. pounds bluestone, 6
pounds lime to so gallons of water
Nothing more was done to this row.
Result-Examined April 10, trees in
fruit and nearly full leaf. Seventeen
! per cent of leaves affected. Result not
satisfactory, but the disease was checked
considerably.
Row 7-On Jan. 16 sprayed with
strong Bordeaux (6-6-50) and repeated
the application of the same mixture on
March ~, just before the trees came into
bloom.
Result, examined April 10, trees in
fruit and nearly full leaf. Almost per.
feet, less than 1 per cent of leaves af-
fected with leaf-curl
Row Same as No and result the
same up to April 10; with a third appli-
| cation of weak Bordeaux, (3-6-5O on
April 81.
! Row 9-Same as No. 8, with fourth
! application to be made later.
Row loon January 10 sprayed with
caustic potash-8 pounds to 40 gallons
of water.
Result-April 10, so per cent of the
leaves affected with leaf-curl Unsatis-
factory results, but no damage to the
trees.
Row lion January 16 painted with
crude petroleum.
Result-Unsatisfactory, so per cent of
leaves affected with leaf-curl.
Row 12-On March IL, just before
trees came into bloom sprayed with
strong Bordeaux (6 pounds bluestone,
6 pounds lime to so gallons water) only
one application was made.
Result-Examined on April 10, when
leaves were nearly out in full and good
crop Of fruit on the trees. The result is
almost perfect prevention of leaf-curl
Only an occasional leaf can be found
| diseased.
Other experiments were made but it
is not necessary for the object Of this
| paper to give them here.
CONCLUSION.
The result of experiments Nos z, 8,
and IL are practically the same, but it
is noted that in case of No. - only one
application is made and that this applica-
ton is sufficient to prevent the leaf-curl.
| TwOpoints are determined: /. That Bor-
deaux made by the formula Of pounds
of bluestone and pounds of fresh lime
to 80 gallons water is the substance to
use. 2. That in the spring Of the year,
Just before the buds burst into bloom, is
the time to make the application. In
the face of these results there is no ex-
cuse for a peach grower to allow his
trees to become seriously infected with
leaf-curl
Other experiments are being conduct
ed to determine whether the leaf-curl
can be checked after the leaves come out
and the disease sets in. 1t is probable
that weak Bordeaux (3-6-50) will
check it to some extent, even after it
appears.
In case the trees are badly affected
and no treatment has been applied,
would recommend that, when the dis
eased leaves begin to drop, the orchard
e 7 ~