FEEDING EXPERIMENTS WITH POISONS. 
1-7 
peach. Ferrous arsenate was much slower in action, but effective, 
as shown by comparison of the condition of beetles fed on poisoned 
foliage with the condition of the beetles on the check. 
Table XCI. 
Tests of killing effect of lead arsenates and other arsenicals on the plum 
curculio on peach. Georgia, 1910. 
Beetles dying from each of the arsenicals. 
Dates of 
death of 
Check 
not 
sprayed. 
Arsenate of lead. 
dered For- ££ 
S3* -! - 
lead. nate - P^ 
- 
nic 
ter- 
SUl- 
phid. 
3 
17 
16 
1 
4 
5 
2 
1 
Arse- 
beetle. 
No. 1. No. 2. No. 3. 
No. 4. 
Xo. 5. Xo. 6. Xo. 7. Xo. 8. 
nic 
ter- 
sul- 
phidJ 
Apr. 17 
]s 
4 
2 
8 
9 
7 
8 
2 
3 
3 
2 
1 
1 
3 I 4 
5 
12 , 7 
6 5 
4 
1 
5 
6 
10 
7 
8 
5 
1 
8 4 
4 
8 
3 
11 
6 
10 
1 
3 
2 
4 
16 
7 
4 
4 
7 
5 
1 
2 
5 
1 
4 
5 
5 
5 
7 
6 
...... 
""% 
2 
3 
9 
9 
3 
S 
2 
6 
3 
1 
19 
5 
3 
4 
9 
5 
7 
4 
2 
7 
2 
6 
5 
10 
3 
6 
1 
20 
21 
22 
1 
1 
i 
23 
13 
2 
1 
2 
2 
1 
1 
8 
8 
5 
3 
G 
24 
- 
25 
11 
2C... 
4 
1 
3 
27 
5 ....:. 
1 5 
8 
28 
3 
3 
3 
1 
""% 
1 
2 
3 
29 
30.... 
1 
2 
1 
7 
4 
5 
2 
3 
1 
1 
4 
3 
2 
May 1 
1 
3 
4 
1 
5 
6 
" . 
7 1 
8 
1 
9 
1 
11 2 

13 
6 
1 
2 
4 
2 
1 
1 
1 
1 
2 
1 
1 
1 
15 

14 

15 
............ 
1 
16 
17 
18 
23 
24 
25 
26 
June 3 
:::::: ;: 
6 
8 
13 
1 
Total. 
46 I 49 | 49 
50 
49 
50 18 
50 
50 
49 
49 
50 . -i'.t 
50 
1 Duplicate test started Apr. 20. 
In Table XCTI are shown results of feeding tests witli several mis- 
cellaneous arsenicals, as specified, used in the self-boiled lime-sulphur 
wash and simply in lime water. As before, twigs were cut from 
peach trees in sprayed plats in orchards and placed under glass 
cylinders. Spraying was done April 28 and 30, and 50 beetles were 
added to each jar April 30. The beetles in all of these tests were 
fresh, having been jarred from peach trees a day or so previous. An 
accelerated killing effect seems to have followed the use of the com- 
bined self-boiled and arsenical sprays, as compared with the arsenical 
used alone. The comparatively slow action of arsenate of iron is 
again noted, though when used in the lime-sulphur wash it compares 
favorably with arsenate of lead. 
