PLANTS IXSECTICIDAL PROPERTIES. 
19 
Table 6. — Comparative results obtained by spraying 11 species of aphids with 
alcoholic extracts derived form " cube," derris, and pyrethrum, etc. — Contd. 
Preparation. 
Percentage of aphids dead within 24 hours. 
d 
© 
1 
J3 
3d 
■~ 05 
o 
3 
-3 
03 M 
a 
c ~ 
^ 05 
o 
a 
3 
< 
05 
s 
ft 
< 
A 
ft 
■s. 
'& 
ft 
-1 
A 
ft 
■/. 
m 
3 
p, 
< 
b 
<_ 
ft 
ra «8 
05 O 
ft 
u 
ftS 
si 
d 
< 
Q 
ft 
05 
75 
ft 
<5 
40 per cent nicotine sul- 
phate: 
1/400 + soap + water 
(2.5+2+100) 
99 
98 
95 
100 
92 
75 
60 
90 
85 
99 
99 
1/800 + soap + water 
(1.25+2+100) 
1/1200 + soap + water 
(0.8+2+100) 
1/400 + soap + water 
(2.5+4+100) 
95 
95 
100 
1/800 + soap + water 
(1.25+4+100) 
Control, alcohol+soap+ 
water: 
4+2+100 
15 
15 
12 
10 
2+2+100 
"*25" 

5 
10 
20 
1+2+100 
1/2+2+100 
2+4+100 
5 
100 
100 
98 
99 
99 
100 
99 
65 
15 
99 
98 
99 
95 
98 
75 
10 
10 
506 
Alcoholic extract + water 
(1+100)+ 10 per cent 
kerosene emulsion: 
"Cube" 
507 
Derris 
509 
Alcoholic extract+water 
(2+100)+ 10 per cent 
kerosene emulsion: 
509 
Alcoholic extract+water 
(2+100)+5 per cent 
kerosene emulsion: 
507 
Alcoholic extract+water 
(1 + 100) +5 per cent 
kerosene emulsion: 
Derris 
506 
"Cube" 
Control, alcohol+water 
(2+100)+: 
10 per cent kerosene 
emulsion 
5 per cent kerosene 
2.5 per cent kerosene 
emulsion 
506 
Alcoholic extract+water 
(l+100)+2.5 per cent 
kerosene emulsion: 
"Cube" 
98 
100 
92 
88 
98 
90 
98 
507 
Derris 
97 
509 
Alcoholic extract+water 
(2+100)+2.5 per cent 
kerosene emulsion: 
509 
Alcoholic extract+water 
(l+100)+2.5 per cent 
kerosene emulsion: 
Pyrethrum 
65 
70 
60 
95 
509 
Alcoholic extract+water 
(2+ 100)+ 1.25 per cent 
kerosene emulsion : 
509 
Alcoholic extract+water 
(1 + 100) + 1-5 per rent 
kerosene emulsion : 
507 
98 
99 
506 
"Cube" 

