18 
BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 
i .". Comparative results obtained by spraying Macrosiphum sp. \ with 
alcoholic and benzene extracts derived from "cube" derris, etc. — Continued. 
Aphids sprayed with alcoholic extracts. 
Aphids sprayed with benzene extracts. 
Preparation. 
Num- 
ber of 
sets. 
Esti- 
mated 
num- 
ber of 
Indi- 
vid- 
uals. 
Percentage of aphids 
dead within— 
Percentage of aphids 
dead within — 
Num- 
ber of 
sets. 
Esti- 
mated 
num- 
ber of 
indi- 
vid- 
uals. 
6 
hours. 
1 
day. 
2 
days. 
3 
days. 
6 
hours. 
1 
day. 
2 
days. 
3 
days. 
Control, solvent 
+ soap + water 
(4 + 2+l00)... 
1 
1 
3 
2 
;oo 
500 
1,500 
1,000 
5 
5 
5 
5 
15 
15 
12 
10 
15 
15 
13 
12 
15 
Control, solvent 
+soap+ water 
(2+2+100)... 
Control, solvent 
+ soap + water 
(1 + 2+100)... 
Control, solvent 
+soap 
(1/2+2 + 100).. 
10 
5 
10 
15 
15 
15 
1 
1 
500 
500 
Table 6. — Comparative results obtained by spraying ll species of aphids with 
alcoholic extracts derived from "cube," derris, and pyrethrum, and with £0 
per cent nicotine sulphate, mired with soap .solution and kerosene emulsion. 
Preparation. 
Percentage of aphids dead within 24 hours. 
6 
© 
ft 
s 
- 
S 
3 
.3 . 
~< 
o c 
o 
C8 
a 
3 
3. « 
— a 
o £ 
o 
03 
a 
.5:3 
Co 
ll 
-. 
a 
3 
,2c 
O 
03 
< 
ft 
CO 
CO 
ft 
< 
n 
d 
co 
m 
ft 
< 
H 
ft 
to 
co 
3 
ft 
< 
© 
03 
E 
ft 
% 
co ° 
3 
p< 
< 
03 
31 
© 
s._; 
o 3 
%% 
1 = 
8" 
a 
d 
•r. 
a 
p. 
d 
CO 
en 
1 
509 
Alcoholic extract+soap+ 
water: 
8+4+100, Pvrothrum. 
4+4+ 
I'vrethrum 
95 
90 
98 
95 
509 
507 
Denis 
506 
"Cube" 
509 
4+2+100— 
thrum 
Derris 
98 
100 
100 
507 
506 
"Cub 
506 
2+4-1 100— 
"Cube" 
Derris 
95 
95 
95 
100 
95 
95 
507 
I'\ rHhnim 
509 
2+2 • : 
Pyrethrum 
Derris 

95 
100 
100 
100 
100 
76 
60 
98 
100 
100 
97 
40 
82 
99 
M 
62 
97 
97 
92 
100 
100 
100 
100 
89 
507 
:;:::: 
506 
"Cube" 
50 
90 
90 
40 
608 
l + 2+](H>— 
"Cube" 
95 
607 
Derris 
Pyrethrum.. 
3 1+2-1 I'm - 
509 
Pyrethrum 
Derris 

506 
"Cube" 

506 
1/2+2+100— 
■•( lube" 
100 
95 
86 
40 
90 
507 
Derris 
Pyrethrum 
■ 100— 
Derris 
608 
"Cube" 
"Cube" 

507 
Derris 
506 
I 100— 
"Cube" 
506 
1/6+2+100— 
"Cube" 
J... 

