MISCELLANEOUS INSECTICIDE INVESTIGATIONS. 
37 
Continued 
Percent of fruit. 
Light infestation, 1-10 
Medium infestation, 11- 
Heavy Infestation, 21- 
scales. 
20 scales. 
over scales. 
Plat. 
Name and dilution. 
a 
~ 
<» 
9 
3 
"8 
tt 
3 
<D 
9 
to 
■2 
a 
'3 
5 
'a 
< 
M 
a 
a 
m 
« 
_3 
'c 
a 
9 
CO 
— 
a 
n 
--; 
I 
Lime-sulphur, 1-7.. 
23.954 
33.554 
38.016 
26. 737 
0.271 
13.245 
8.677 
3.59S 
0.108 

2.066 
1.028 
II 
(1) Commercial so- 
dium sulphid, 
12.5 pounds-50 36. 167 
50.000 
67.021 
10.000 
3.377 
6.535 
6.382 

1.397 
1.960 
6.382 

III 
Caustic potash, 11 
pounds+sulphur, 
12.5 pounds-50 
61.111 
49. 73S 
42.312 11. 
7.339 
6.570 
2. 777 
12.041 11. 
IV 
(2) Commercial so- 
dium sulphid, 
46. 666 
39.916 
12.873 14. 
1.839 
12.605 
V 
Caustic* soda, 11 
pounds + sulphur, 
12.5 pounds-50 
20.005 
36.690 
48.571 
1.018 
21.561 
7.857 
.268 
7.19 
2.142 
VI 
Lime-sulphur, 1-7+ 
nitrate of soda, 50 
pounds-50 
22.305 
40.707 
20.000 
1.313 
5.309 

.093 
3.539 

VII 
Caustic soda, 15 
pounds -|- sulphur, 
17.1 pounds-50 
9.797 
46.153 
28.365 
39.731 
.261 
1.398 
.901 
4.418 
.0(35 
. 699 . 480 
. 959 
VIII 
Caustic potash, 15 
pounds+sulphur. 
17.1 pounds-50 
10.663 
21.229 43.722 
.090 

2. 661 

1.901 
IX 
Check— unsprayed. . 25. 654 48. 829 IS. 356 33. 281 
1 1 1 1 
6.358 14.046 
9. 205 18. 506 15. 393 11. 705 64. 383 U.372 
1 1 1 1 1 
Table XX. — San Jose scale insecticide investigations (commercial table), Benton Harbor, 
Mich., 1914. 
Plat. 
Name and dilution. 
Number 
Total 
of count 
number 
trees. 
of fruits. 
19 
2,925 
11 
2,127 
7 
■2,721 
5 
673 
7 
2. 1 it 
11 
1,074 
8 
2,403 
8 
1,558 
49 
14,693 
Percent of fruit. 
Free from 
scale to 
liiU'hl in fes- 
tal ion. 
market- 
able. 
Medium to 
heavy in- 
festation, 
unmarket- 
able. 
I 
II 
III 
IV 
V 
VI 
VII 
VIII 
IX-XI 
Lime-sulphur, 1-7 
(1) Commercial sodium sulphid, 12. S pounds-50 
Canst icpotash.llpounds+sulphur, 12.5 pounds-50 
(2) Commercial sodium sulphid, 12.5 pounds-50... 
Caustic soda. 11 pounds+sulphur, 12.5 pounds-50. 
Lime-sulphur. 1-7 + nitrate of soda, 50 pounds-50. . 
Caustic soda, 15 pounds+sulphur , 17.1 pounds-50. . 
Caustic potash, 15 pounds+sulphur, 17.1 pounds-50 
Checks— unsprayed 
IN. 052 
94.359 
83.352 
vii. v,: ; 
97.942 
98.511 
98.378 
99. 167 
1.948 
5.64J 
16.648 
19. 167 
2.058 
1. 189 
1.622 
39.207 
Although the spray materials were subjected to a severe test, all, 
with the exception of the materials employed in Plats III and [V,gave 
satisfactory results. Lime-sulphur was used alone and also in combi- 
nation with nitrate of soda. The addition of sodium nitrate did not 
affect the insecticidal value of the lime-sulphur. These plats yielded 
98.052 and 9S.511 per cent of marketable fruit, respectively. The 
homemade sodium and potassium sulphur solutions, with the excep- 
tion of the materials used in Plat III, gave 97.972 to 99.167 per c ent of 
