14 
BULLETIN 1201, U. S. DEPARTMENT OF AGRICULTURE. 
Table 1. Comparative results obtained by testing various pointers against six 
species of insects in the form of dusts and stomach poisons. 
Species and prep- 
aration. 
Number of insects 
and how tested. 
Percentage of insects dead within— > 
Sam- 
ple 
No. 
Num- 
ber of 
indi- 
vid- 
uals. 
Num; How 
6 
hours. 
1 
day. 
2 
days. 
3 
days. 
4 
days. 
5 
days. 
6 
days. 
7 
days. 
33a 
33b 
109 
110 
Roaches: 
Amianthium '-'.. 
Do* 
Hellebore 
120 
120 
120 
25 
25 
25 
25 
120 
30 
20 
33 
10 
36 
10 
20 
70 
90 
40 
20 
50 
20 
20 
40 
90 
10 
10 
10 
10 
100 
( 9 ) 
6 
100 
40 
20 
40 
40 
100 
100 
100 
100 
6 Dusted. 
6 ...do... 
6 l...do... 
1 |...do... 
1 ...do... 
1 ...do... 

1 

8 
24 
20 
4 



3 

28 
10 

11 
24 
5 

48 
15 
10 
100 






""ioo" 

3 
15 
50 

25 
25 
50 

5 
8 
7 
44 
32 
72 
70 
4 
7 
10 
27 
10 
75 
100 

24 
57 
28 
15 
88 
60 
100 
50 
13 
13 
76 
84 
100 
92 
5 
13 
30 
54 
20 
92 
61 
79 
36 
88 
100 
89 
90 
54 
88 
97 
98 
78 
88 
99 
99 
84 
SS 
100 
100 
91 
88 
56 
Sabadilla * 
Pvrethrum 
"Cube" 
Control 
Grasshoppers: 
Amianthium. . . 
Do 
Do» 
Hellebore 
Sabadilla 
Pyrethrum 
Control 
Silkworms: 
Sabadilla' 1 
Do" 
Hellebore 
Do... 
103 
601 
1 
6 
2 
2 
2 
...do... 
96 
7 
23 
50 
100 
30 
97 
96 
9 
57 
80 
96 
12 
90 
85 
96 
21 
100 
100 
96 
35 
33a 
33b 
35f 
Fed.... 
...do... 
Dusted. 
109 
56 
1 Fed.... 
3 Dusted. 
1 ...do... 
50 
100 
90 
100 
103 
2 
7 
9 

57 
63 
48 
40 
% 
100 

76 
97 
65 
85 
100 

87 
99 
7.", 
85 
30 
93 
100 
86 
95 
55 
97 
121 
113 
Dusted. 
...do.... 
too 
109 
109 
4 ...do.... 
2 Fpd 
93 
100 
100 
103 
Pyrethrum 
Amianthium. . . 
Do 
5 
2 
2 
4 
9 
1 
1 
1 
1 
5 
i" 
5 
2 
1 
2 
2 
1 
1 
1 
1 
Dusted. 
Fed.... 
...do.... 
Dusted . 
33a 
33b 
110 
Derris 
Control 

20 
10 
40 
20 
12 
100 

60 
50 
60 
30 
52 

SO 
70 
70 
40 
60 

100 
LOO 
100 
90 
96 



33a 
Flies: 
Amianthium. . . 
Do 
Dusted. 
...do.... 
Fed.... 
...do... 
...do... 
Dusted. 
...do... 
33b 
33a 
Do 
33 b 
Do 
Tomato? 
Derris » 
100 
100 
11 
110 
103 
Pyrethrum 
Control 
5 
68 
50 
100 

too 
100 
100 

28 
68 
100 
•_'s 
33 
109 
Honeybees: 
Hellebore 
Amianthium... 
Sabadilla 
Control 
Potato-beetle larvae: 
Derris 
Dusted. 
...do... 
...do.... 
35 f 
56 

110 
Dusted. 
...do... 
...do... 
501 
"Cube" 
Pyrethrum 
Control 
103 
i Where a test did not continue for 7 days, col- 
umns are left blank. 
J No. 200 powder from bulbs. 
1 No. 200 powder from leaves. 
* No. 100 powder, oil extracted. 
6 No. 40 powder, oil extracted. 
e No. 40 powder, oil not extracted. 
7 No. 60 powder from vines. 
* From derris paper {61). 
» Many. 
Table 2. — Comparative results obtained by dusting aphids with various ponders. 
Species and preparation. 
Esti- 
mated 
number 
of indi- 
viduals. 
Num- 
ber of 
sets. 
Percentage of aphids dead within— 1 
Sample 
No. 
6 hours. 
1 day. 
2 days. 
3 days. 
4 days. 
56 
Aphis sp. B: 
Sabadilla s 
LOO 
LOO 
100 
LOO 
100 
100 
100 
100 
100 
100 
100 



5 
5 
10 
10 
10 
25 
15 
5 
25 
75 
10 
40 
40 
50 
50 
50 
80 
40 
113 

23k 
Chinaberrv 4 
33a 
Amianthium * 
33b 
Do' 
35e 
Do< 
35f 
Do* 
502 
Hellebore 
103 
Pyrethrum 
95 
25 
15 
100 
110 
Derris 
100 
100 
501 
"Cube" 
• Where a test did not continue for 4 days col- 
umns are left blank. 
■ Oil extracted. 
8 Oil not extracted. 
* No. 200 powder of leaves. 
» No. 200 powder of bulbs. 
