18 
BULLETIN 278, TJ. S. DEPARTMENT OF AGRICULTURE. 
Table X. — Sound and wormy apples from sprayed and unsprayed plats. 
[Poison test, Benton Harbor, Mich., 1913.] 
Plat 
No. 
Treatment. 
Tree 
No. 
Condition of fruit. 
"Wormy. 
Sound. 
Total. 
Per cent 
sound. 
I 
Arsenate of lead (paste), 2 pounds to 50 gallons of 
1 
2 
3 
4 
5 
129 
132 
135 
157 
125 
2,144 
2,490 
2,244 
1,850 
1,927 
2,273 
2,622 
2,379 
2,007 
2,052 
94.32 
Plat total 
94.96 
94.32 
92.17 
93.90 
678 
10,655 
11,333 
94.01 
Arsenate of calcium, homemade (1), at rate of 
8/10 pound sodium arsenate to 50 gallons lime- 
sulphur solution 
II 
1 
2 
3 
4 
5 
398 
208 
180 
254 
331 
2,767 
1,443 
740 
720 
976 
3, 165 
1,651 
920 
974 
1,307 
87.42 
Plat total 
87.40 
80.43 
73.92 
74. 67 
1,371 
6,646 
8,017 
82.89 
Arsenate of calcium, homemade (2), at rate of 
8/10 pound sodium arsenate to 50 gallons lime- 
sulphur solution 
Plat total . 
III 
I 
3 
4 
5 
580 
388 
497 
387 
260 
2,607 
897 
1,195 
955 
600 
3,187 
1,285 
1,692 
1,342 
860 
81.80 
69.80 
70.62 
71.16 
69.76 
2,112 
6,254 
8,366 
74. 75 
Arsenate of calcium, commercial (paste), 1^ 
pounds to 50 gallons lime-sulphur solution 
Plat total 
IV 
1 
2 
3 
4 
5 
251 
241 
53 
240 
303 
813 
918 
277 
681 
1,025 
' 1,064 
1,159 
330 
921 
1,328 
76.41 
79.20 
83.94 
73.94 
. 77. 18 
1,088 
3,714 
4,802 
7734 
Arsenite of zinc powder, f pound to 50 gallons 
lime-sulphur solution 
V 
1 
2 
241 
83 
2,345 
978 
2,586 
1,061 
90.68 
Plat total 
92.17 
324 
3,323 
3,647 
91.11 
Arsenate of zinc, homemade, at rate of 8/10 
pound sodium arsenate to 50 gallons lime-sul- 
VI 
1 
2 
3 
4 
5 
365 
503 
376 
213 
186 
2,342 
1,867 
1,731 
1,386 
1,951 
2,707 
.2,370 
2,107 
1,599 
2,137 
86.51 
Plat total 
78.78 
82.15 
86.68 
91.92 
1,643 
9,277 
10,920 
84.95 
Check (unsprayed) 
VII 
1 
2 
3 
4 
5 
927 
670 
1,082 
606 
933 
877 
503 
1,086 
592 
780 
1,804 
1,173 
2,168 
1,198 
1,713 
48.61 
Plat total 
42.88 
50.01 
49.41 
45.53 
4,218 
3,838 
8,056 
4764 
The arsenate of lead plat produced 94.01 per cent of fruit free 
from codling-moth injury. Arsenate of calcium, homemade (1), 
fell below this in its efficiency, the percentage of sound fruit 
being 82.89. Arsenate of calcium, homemade (2), fell still lower in 
efficiency, producing 74.75 per cent of fruit free from this insect. 
Each of these materials burned the foliage very slightly. Arsenate 
