20 
BTJULETTN 1201, U. S. DEPARTMENT OF AGRICULTURE. 
Table «;.- Comparative results obtained by spraying // species of aphids with 
holic extracts derived form "cube," derris, and pyrethrum, etc, — Contd. 
Preparation. 
Percentage of aphids dead within 21 hours. 
c 
v. 
o 
c. 
6 
S3 
7. 
6 
a 
Z. w 
o 
09 
s 
A 
&o 
•- c3 
O O 
I- >- 
o 
c3 
e 
a • 
CO 
11 
o 
2 
3 
£d 
c c 
o 
2 
pq 
w 
a 
u 
ft 
■ « 
2 8 
A 
ft 
09 
c_: 
is 
.5-i 
d 
d 
■9 
"I 
q 
ft 
-< 
506 
Alcoh' water 
(1/2+ 100)+ 1.25 per cent 
kerosene emulsion: 
"Cube" 
90 
80 
50 
15 
20 
20 
507 
509 
509 
Alcoholic extract + soap+ 
water (1 + 4+100): 
507 
506 
Table 7. — Comparative results obtained by spraying aphids with varioui 
trials derived from "cube." 
Sample 
No. 
506 
525 
525 
506 
506 
525 
525 
506 
506 
525 
525 
506 
506 
525 
526 
526 
526 
526 
528 
Preparation. 
Alcoholic extract + 
soap + water: 
2+2+100— 
Cold 
llnl 
1 + 2+100— 
II. .i 
Cold 
Cold 
ii»t 
1/2+2+100— 
Eol 
Cold 
1/3+2+100— 

Hoi 
1/4+2+100— 
Bol 
Cold 
1/6+2+100— 
Cold 
Hot 
[{csin dissolved In al- 
coh ol+soap + 
water: 
2+2+100 
1 + 2+Hio 
I J ' -' I 100 
- • « f 100 
2+2+100 
2+2+100 
100 
I 2 • 2 • 100 
Filtrate from 
+soap+water: 
2+4+100 
Insects tested. 
Esti- 
mated 
num- 
ber of 
indi- 
viduals 
2+2+100 
' • 100 
LOO 
Cold water extracl \ 
iter 
- • 1 • I'm 
500 
300 
300 
300 
2,500 
500 
500 
3,000 
2,500 
500 
500 
2,500 
1,500 
500 
300 
500 
500 
100 
300 
500 
500 
100 
Num- 
ber of 
sets. 
Species. 
Aphis sp. E. 
do 
....do 
....do 
Macrosiphum sp. A 
....do 
Aphis sp. E 
do 
do 
Macrosiphum solan- 
ifolii 
do 
Lphum sp. c. 
Aphis spiraecola. . . 
do 
Macrosiphum sola- 
nifolii 
....do 
Macrosiphum sp. C 
Aphis sp. E 
Macrosiphum solani 
folii 

E 
Percentage of aphids dead 
within — i 
hours. 
30 
li-l 
LOO 
1 
day. 
2 
days. 
100 
LOO 
100 
3 
days. 
60 
50 
35 
.t test did not continue for a days, columns arc left blank. 
