30 
BULLETIN 1482, U. S. DEPT. OF AGRICULTURE 
which there are two generations of the curculio this treatment has a 
substantial effect in reducing the infestation in the peaches harvested. 
The importance of this application is apt to be overlooked by the 
grower who is not inclined to insure his crops early in the season 
against attacks of pests. 
An application of arsenate of lead, made four weeks before mid- 
season or late varieties of peaches are due to ripen, is indispensable if 
the curculio is to be satisfactorily dealt with in the South, where two 
generations of the insect frequently occur. 
Arsenate of lead, used at the rate of three-quarters of a pound to 
each 50 gallons of water, is not so effective against the curculio as 
when used at the rate of 1 pound to each 50 gallons of water. 
The insecticidal action of triplumbic arsenate of lead is too slow for 
best results in controlling the curculio. The diplumbic arsenate 
should always be used (experiments in 1921). 
The addition of calcium casemate did not increase the effectiveness 
of arsenate of lead or that of self-boiled lime-sulphur in controlling 
the pests that attack the peach fruit. 
The mixture of sulphur, hydrated lime, and calcium casemate, 
tested in combination with arsenate of lead, gave good results in 
controlling brown rot and scab, but under the conditions prevailing 
in central Georgia the mixtures tested resulted in injury to the foliage 
sprayed. This is especially true of the mixture used in 1922, which 
at an abnormally early date caused complete defoliation. 
Table 21. — Summary of results, in 1921 to 1924, of using the standard schedules for 
spraying and dusting recommended to peach growers 
FROM HILEY PEACHES 
Treated with standard spray 
Treated with standard dust 
Untreated 
Per cent of total fruit — 
Per cent of total fruit— 
Per cent of total fruit— 
Year 
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1-1 
1921 
TT 
6.9 
3.2 
90.5 
X 
18.1 
2.9 
79.8 
XII- 
40.8 
4.9 
57.2 
1922 
T 
1.8 
1.1 
0.8 
96.5 
VI. 
11.3 
5.2 
0.9 
84.5 
VII.. 
22.9 
32.0 
64.9 
13.9 
1923 
T .. 
.9 
5.8 
18.6 
77.5 
Vi- 
1.5 
10.2 
17.8 
73.6 
VIII. 
6.4 
30.6 
92.5 
2.4 
1924 
I... 
3.9 
2.3 
8.6 
86.0 
lli. 
4.6 
1.6 
9.1 
85.6 
v.... 
10.5 
16.1 
71.5 
20.4 
FROM ELBERTA PEACHES 
1921 
1922L 
II.. 
28.3 
35.9 
3.4 
44.1 
X._ 
54.9 
55.8 
2.2 
16.2 
XII.. 
45.4 
77.8 
45.6 
4.0 
1923 
1924 
I... 
I... 
6.1 
21.9 
1.0 
6.9 
8.6 
23.3 
85.3 
57.9 
Vi- 
lli. 
16.2 
30.7 
3.4 
8.4 
24.5 
44.9 
62.2 
37.3 
VIII. 
V 
28.2 
54.1 
11.9 
30.3 
67.0 
89.7 
18.6 
2.9 
1 The total number of Elberta peaches harvested in 1922 on the count trees was 3,802, or an average of 54.3 
peaches for each of the 70 count trees. The total number of Hiley peaches harvested in the same year on the 
70 count trees was 65,534, or an average of 936.2 per tree, this average being 17 times as great as that for the 
Elberta peaches. 
Colloidal sulphur also gave good results in controlling brown rot 
and scab, but when this material is used with arsenate of lead lime 
must be added or severe burning will result. In these experiments 
