16 
BULLETIN L201, U. S. DEPARTMENT OF AGRICULTURE. 
Table 4. — Comparative results obtained by spraying aphid* with the alcoholic 
and benzene extracts derived from various powders. 
Sam- 
ple 
No. 
Preparation. 
Insects tested. 
Esti- 
mated 
num- 
ber of 
individ 
uals. 
Num- 
ber of 
sets. 
Species. 
Percentage of aphids dead 
within — ' 
1 day 
2 da vs. :s days 
510 
510 
505 
505 
504 
504 
Ml 
511 
508 
508 
509 
509 
507 
507 
506 
506 
510 
50S 
504 
Ml 
508 
Alcoholic extracti 
soap + water (2+4+ 
100): 
Sabadilla 
Do 
Chinaberry 
Do ..' 
Amianthium 
Do 
Castor bean 
Do 
Hellebore 
Do 
rvrethrnm 
' Do 
Derris 
Do 
"Cube" 
Do 
Control, akohol+ 
soap + water (2+ 
4+100) 
Do 
Alcoholic extract+ 
soap+water(8+ 
2+100): 
Sabadilla 
Chinaberry 
Amianthium 
Castor bean 
Hellebore 
Control, alcohol+ 
soap + water (4+ 
2+100) 
Benzeno extract + 
soap + water (8+ 
2 + 100): 
Sabadilla 
Chinaberry 
Amianthium 
Castor bean 
Hellebore 
Control, benzene + 
soap+water(8+ 
2+100) 
40 per cent nicotine 
sulphate (1/1200)+ 
soap + water (0.8+ 
2+100) 
100 
loo 
1(11) 
LOO 
LOO 
LOO 
L00 
100 
L00 
100 
LOO 
KM) 
LOO 
KM) 
L00 
L00 
500 
500 
1 
500 
1 
500 
1 
500 
1 
500 
1 
Aphis sp. A. 
Aphis sp. B. 
Aphis sp. A. 
Aphis sp. B. 
Aphis sp. A . 
Aphis sp. B. 
Aphis sp. A. 
Aphis sp. B. 
Aphis sp. A. 
Aphis sp. B. 
Aphis sp. A. 
Aphis sp. B. 
Aphis sp. A. 
Aphis sp. B. 
Aphis sp. A . 
Aphis sp. B. 
Aphis sp. A. 
Aphis sp. B. 
Macrosiphum sp. A 
do 
....do 
....do 
....do 
.do. 
do. 
■Ml 
50 
.do. 
20 
30 
30 
40 
10 
60 
30 
20 
30 
10 
'.>:, 
'.i.-. 
95 
95 
95 
100 
50 
95 
Where a test did not continue for 3 days, columns arc left blank. 
