10 
BULLETIN 1482, U. 
DEPT. OF AGRICULTURE 
cussion of the data for 1921 will not be repeated in this publication 
but the results will be referred to in deriving conclusions. 
EXPERIMENTS IN 1922 
In planning the experiments in spraying and dusting for the season 
of 1922. special attention was given to plats which should receive an 
application of arsenate of lead when 75 per cent of the petals had fallen 
and another application four weeks before the fruit ripened, besides 
other more usual applications. The two applications were intended 
for continuing the tests of the early treatment with arsenate of lead 
as a preventive of curculio infestations in the young fruits, and tests 
of the late arsenical treatment as a protection of the ripening peaches 
from the second brood of larvae. Schedules were also included for 
testing the comparative effectiveness of the sprays and dusts. A 
combination of sulphur, lime, and calcium casemate, the ingredients 
of which are mixed together dry before adding water, was tested on 
one plat for effectiveness against brown rot and scab. To test the 
possible usefulness of a "sticker." or "spreader." a plat was provided 
which received the same treatment as the standard plat, except that 
in each application calcium casemate was added to the spray. Table 
3 gives an outline of the experiments planned for the season of 1922. 
Table 3. — Outline of experiments in spraying and dusting peach trees, for the season 
of 1922, Fort Valley, Ga, 
Time of application 
Plat 
As petals fall 
When calyces 
are shedding 
Two weeks after 
shedding of 
calyces 
! 
Four weeks Just before 
before harvest picking 
I 
A. L. L 
A. L.-L 
A. L.-S. B 
A. L.-S. B.-C_ 
A. L.-S. B 
A. L.-S. B 
A. L.-S 
SO-5-15 
i 
A. L.-S. B 
n 
TTT 
A. L. L. C 
A. L.-L.-C 
A. L.-L 
A. L.-S. B.-C— 
S. B 
IV 
V 
VI 
A. L. L 
A. L. L 
80-5-15 
A. L.-L 
A. L.-L 
80-5-15 
A. L.-S.B 
A. L.-S 
80-5-15 
80-20 dust 
vn> 
• Check plat; not treated. 
A. L. = Arsenate of lead powder, 1 pound to 50 gallons of spray. 
L. = Milk of lime, made from 3 pounds of stone lime per 50 gallons of spray. 
C . = Calcium casemate, 6 ounces to 50 gallons of spray. 
S. B. = Self- boiled lime-sulphur mixture, 8-8-50. 
S. = Sulphur 6 pounds, hydrated lime 4 pounds, and calcium caseinate 8 ounces, per 50 gallons spray. 
(Sulphur, lime, and calcium casemate were mixed dry and then the water was added.) 
80-5-15=Dust: sulphur, 80 per cent: arsenate of lead, 5 per cent; lime, 15 per cent. 
As in 1921, the experiments were performed on trees of the varieties 
Hiley and Elberta. Both orchards were practically level and had a 
sandy loam soil. The crop that matured in the Elberta experimental 
orchard, however, was so light that the results from it are not 
reliable, and only the results of the experiments with the Hiley 
peaches will be given. From 500 to 1,000 fruits should be harvested 
from each record tree for reliable results from spraying or dusting. 
An average of only 54.7 fruits per tree were harvested from the 
Elberta record tree- in 1922. 
The orchard was divided, as in 1921. into plats of as nearly equal 
size as practicable. Each plat consisted of about 150 trees, except 
the check plat, which was in two parts, in opposite corners of the 
