CONTROL OF PEACH DISEASES IN GEORGIA 
15 
used in 1922, and were supposed to be safer, since they contained a 
large excess of lime to reduce the danger of injury from the combina- 
tion of arsenate of lead and sulphur. Three applications of self- 
boiled lime-sulphur were compared with two applications of these 
mixtures for brown-rot and scab control. The testing of the com- 
parative effectiveness of dusting and spraying was continued. Two 
formulas for dusting, with different percentages of sulphur, were 
tested for effectiveness against brown rot and scab. 
Table 7 gives in outline the schedules used in the experiments in 
1923. 
Table 7. — Outline of experiments in spraying and dusting peach trees, for the season 
of 1923, Fort Valley, Ga. 
Time of application 
Plat 
As petals fall 
When calyces are 
shedding 
Two weeks after 
shedding of calyces 
Four weeks before 
harvest 
I. 
A. L.-L 
A. L.-L.-C 
A.L. 3-L. 3 
A. L.-L 
A. L.-L.-C 
A.L. 3-S. B 
A. L.-L 
A. L.-L..., 
0-5-95. . 
S.B 
C.-S.B 
A.L.3-S.B 
S.B 
A.L.-S 
80-5-15 
50-5-45 
A. L.-S. B. 
II 
III. 
A.L.-C.-S. B. 
A. L. 3-S. B. 
IV 
A. L.-S. B. 
vl""""IC™~""I 
b^95~.~.l'.~.'.V. ..... 
A. L.-S. 
80-5-15. 
VII.. 
0-5-95- 
0-5-95. 
50-5-45. 
VIII' 
IX. 
A.L.-L 
A.L.-S. 1 
A. L.-S. 1. 
Check plat; not treated. 
A. L.= 
A.L. 3= 
L.= 
L.3= 
C= 
S.B.= 
S.l = 
0-5-95= 
80-5-15= 
50-5-45= 
Arsenate of lead powder, 1 pound to 50 gallons of spray. 
Arsenate of lead powder, % pound to 50 gallons of spray. 
Milk of lime, made from 3 pounds of stone lime per 50 gallons of spray. 
Milk of lime, made from 234 pounds of stone lime per 50 gallons of spray. 
Calcium caseinate, 6 ounces to 50 gallons of spray. 
Self-boiled lime-sulphur mixture, 8-8-50. 
Sulphur 6 pounds, hydrated lime 8 pounds, calcium caseinate 12 ounces per 50 gallons of spray. 
(Sulphur, lime, calcium-caseinate mixture.) 
Sulphur 3 pounds, hydrated lime 4 pounds, calcium caseinate 6 ounces per 50 gallons of spray. 
(Sulphur, lime, calcium-caseinate mixture.) 
Dust; arsenate of lead, 5 per cent; hydrated lime, 95 per cent. 
Dust; sulphur, 80 per cent; arsenate of lead, 5 per cent; lime, 15 per cent. 
Dust; sulphur, 50 per cent; arsenate of lead, 5 percent; lime, 45 per cent. 
As in the two years preceding, the experiments for 1923 were 
duplicated on two varieties of peaches, the Hiley and the Elberta. 
The orchards used were on sandy loam soil, and the land was generally 
level. Since the orchards were about one-half mile apart a test of 
the various treatments was afforded in two different localities. 
About 2,600 trees, divided for the most part into plats of as nearly 
150 trees as practicable, were used in the experiments. (Figs. 7 and 
8.) Three plats of each variety, including the check plats, were com- 
posed of about 75 trees each. Near the center of each plat 10 trees 
were selected as record trees, the fruit from which was cut open and 
examined for injury from the curculio, brown rot, and scab. All 
" drops" from these record trees were collected at intervals, and 
examinations made for data on the curculio infestation. In the 
season of 1923, 68,746 peaches were cut open to obtain data from 
which to draw conclusions. 
