EXPERIMENTS FOR CONTROL. 
23 
mixture spread more rapidly than the straight solutions, but did not 
prove entirely satisfactory. 
While applying a spray composed of lye-sulphur, flowers of sul- 
phur, and flour paste, it was observed that the material spread over 
the leaves very rapidly. This flour paste seemed to meet the demand 
for a " spreader" and was accordingly mixed with the lime-sulphur 
solutions. The result was a smooth mixture, without precipitate, 
which spread over the leaves in a most effective manner (PI. V, fig. 2) 
and gave unusually effective results as an insecticide. The proper 
proportions were found, on experimentation, to be 4 gallons of flour 
paste (4 pounds of flour) to 100 gallons of spray. 
Lime-sulphur and flour paste proved a very effective and rela- 
tively cheap spray for use against the red spider and was extensively 
used in the control work carried on in the Sacramento Valley in 1911. 
Table IV. — Spraying experiments with lime-sulphur solutions against the red spider 
No. 
Date. 
Material. 
Applica- 
tion. 
CO 
i_, co 
a 
CO 
1 
a 
CO 
Is 
o 
u 
<v 
M JL A 
sf3g 
Ph 
"3 
Mi 
O 
O . 
rH co 
CD © 
CO 
O 
o 
"3 

o 
O 
i 
> 
o 
a 
CD 
m 
s 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
June 23 
27 
July 1 
5 
6 
6 
9 
19 
19 
19 
Lime-sulphur, 36° Baume, 
1-75 i. 
Lime-sulphur, 36° Baume, 
1-75; flour paste, 4-100. 
Lime-sulphur, 36° Baume, 
1-50; flour paste, 4-100. 
Lime-sulphur, 36° Baume, 
1-60; flour paste, 4-100. 
Lime-sulphur, 36° Baume, 
1-86; flour paste, 4-100. 
Lime-sulphur, 36° Baume, 
1-86; flour paste, 4-100. 
Lime-sulphur, 36° Baume, 
1-100; flour paste. 4-100. 
Lime-sulphur, 33° Baume, 
1-70; flour paste, 4-100. 
Lime-sulphur, 33° Baume, 
1-70; flour paste, 4-100. 
Lime-sulphur, 33° Baume, 
1-70; flour paste, 4-100. 
Thorough. 
...do 
...do 
...do 
...do 
...do 
...do 
...do 
...do 
Careless . . . 
360 
698 
697 
964 
593 
593 
906 
143 
509 
509 
135 
692 
691 
945 
534 
586 
892 
142 
440 
55 
37.5 
99.0 
99.0 
98.1 
90.0 
98.8 
98.4 
99.7 
86.4 
10.8 
97.1 
99.7 
92.9 
.10. 26 
.35 
.49 
.51 
.32 
.32 
.29 
.38 
.38 
.38 
Tag. 
...do. 
...do. 
...do. 
...do. 
Field 
Tag. 
...do. 
Field 
...do. 
None. 
Do. 
Slight in- 
jury. 
Do. 
None. 
Do. 
Do. 
Do. 
Do. 
Do. 
1 The terms "lime-sulphur, 1-75," " flour paste, 4-100," etc., denote 1 gallon of lime-sulphur to 75 gallons 
of water, 4 gallons of flour paste to 100 gallons of water, etc. 
Note.— The amount of material necessary per acre varies from 300 gallons in light foliaged hops to 500 
gallons in heavy foliaged hops. 
Table IV gives an accurate conception of the efficiency of the lime- 
sulphur-and-flour-paste spray. The percentages obtained in Nos. 1 
and 2 of this table represent graphically the relative efficiency of lime- 
sulphur solutions with and without the flour paste. A great differ- 
ence in the percentage is again noted in Nos. 9 and 10. In No. 9 the 
material was thoroughly applied and in No. 10 applied very care- 
lessly. The lower percentages obtained late in the season as compared 
with the higher percentages secured earlier in the season are due to 
