28 
BULLETIN 1027, U. S. DEPARTMENT OF AGRICULTURE. 
Table 12. — -Copper, lead, and arsenic remaining on sprayed grapes at picking time — 
Continued. 
Arsenic 
(As). 
Lead (Pb). 
Copper 
(Cu). 
Sam- 
Spray material used. 
Date 
sprayed. 
Condition 
of samples 
analyzed. 
Loss 
ple 
No. 
Orig- 
inal 
fruit. 
Dried 
fruit. 
Orig- 
inal 
fruit. 
Dried 
fruit. 
Orig- 
inal 
fruit. 
Dried 
fruit. 
on 
dry- 
ing. 
1915. 
Parts per million. 
P.ct. 
23690 1 
3 lbs. lead arsenate 
July 5, 17. 
Unwashed . 
0.29 
1.40 
0.9 
4.3 
0.6 
2.9 
79.0 
(paste), 1 lb. laundry 
Washed 3 . . 
.22 
1.00 
.4 
1.9 
.3 
1.4 
soap, 3-3-50 Bor- 
deaux (spray applied 
with fine nozzles set 
at rear of sprayer). 5 
258361 
Check plat (unsprayed)e 
Unwashed . 
.0 
.0 
.5 
2.6 
. 9 
4.7 
81.0 
Washed 3 . . 
•0 
.0 
.5 
2.6 
.6 
3.2 
1916. 
258371 
1 gall. lime-sulphur, 33 J 
Dormant 
Unwashed . 
.05 
.26 
.7 
3.6 
1.1 
5.6 
80.4 
B.),7 galls, water. 
spray. 
Washed 3 . . 
.02 
.10 
.6 
3.1 
1.1 
5.6 
4-4-50 Bordeaux s 
June 16. 
258381 
8 lbs. Bordeaux (com. 
June 1, 12. 
Unwashed . 
.12 
.63 
.8 
4.2 
1.4 
7.4 
81.1 
paste), I lb. lead arse- 
Washed 3 . . 
.07 
.37 
.6 
3.2 
1.1 
5.8 
nate (powder), 50 
galls, water. 
8 lbs. Bordeaux (com. 
Aug. 2. 
paste) , 50 galls ."waters 
25903 i 
Check plat (unsprayed) 7 
Unwashed . 
.04 
.17 
.6 
2.6 
.8 
3.4 
76.5 
Washed 3 . . 
.04 
.17 
.6 
2.6 
.4 
1.7 
259041 
1 lb. soap, 1J lbs. lead 
July 6, 21. 
Unwashed . 
3.00 
12.60 
7.5 
31.6 
4.1 
17.3 
"76." 3 
arsenate (powder), 
Washed 3 . . 
1.00 
4.20 
3.5 
14.8 
1.4 
5.9 
3-3-50 Bordeaux 
(used trailers with 
medium nozzles). 7 
259051 
1 lb. soap, 2\ lbs. lead 
do 
Unwashed . 
.70 
3.20 
3.9 
17.7 
2.1 
9.5 
78.0 
arsenate (powder), 
Washed 3 . . 
.60 
2.70 
2.8 
12.7 
1.3 
5.5 
3-3-50 Bordeaux 
(used trailers with 
medium nozzles). 7 
259061 
1 lb. soap, 2\ lbs. lead 
do 
Unwashed . 
3.80 
16.10 
12.0 
50.8 
3.2 
13.6 
76.4 
arsenate (powder), 
Washed 3 . . 
2.60 
11.00 
7.6 
32.2 
1.7 
7.2 
3-3-50 Bordeaux 
(used trailers with 
medium nozzles). 
1 lb. lime, 1 lb. soap, 2-h 
Aug. 12. 
lbs. lead arsenate 
(powder), 50 galls. 
water (double appli- 
cation). 7 
25907 1 
1 lb. soap, \\ lbs. lead 
July 6. 21. 
Unwashed . 
.30 
1.30 
2.4 
10.3 
2.3 
9.8 
76.6 
arsenate (powder), 
Washed 3 ... 
.30 
1.30 
1.3 
5.6 
1.5 
6.5 
3-3-50 Bordeaux 
(used trailers with 
fine nozzle). 7 
26016 s 
4-3-50 Bordeaux (me- 
June 15. 
Unwashed . 
.15 
.60 
.7 
2.9 
2.0 
8.3 
75.8 
dium set nozzle). 9 
Washed 3... 
.15 
.60 
.7 
2.9 
1.3 
5.4 
26017 8 
4-3-50 Bordeaux (me- 
do 
Unwashed . 
1.80 
7.30 
5.1 
20.7 
2.7 
11.0 
"75.' 4 
dium set nozzle). 
Washed 3... 
.70 
2.80 
2.1 
8.5 
1.5 
6.1 
2| lbs. lead arsenate 
June 28. 
(powder), 2 lbs. laun- 
dry soap, 3-3-50 Bor- 
deaux (sprayed with 
trailer, fine nozzle). 
2\ lbs. lead arsenate 
Aug. 4. 
(powder), 1 lb. resin 
soap, 3-3-50 Bor- 
deaux (sprayed with 
trailer, fine nozzle). 9 
26018 8 
4-3-50 Bordeaux (me- 
June 15. 
Unwashed . 
3.70 
16.30 
10.4 
45.8 
3.4 
15.0 
77.3 
dium set nozzle). 
Washed 3 ... 
.90 
4.00 
3.1 
13.7 
1.4 
6.2 
2| lbs. lead arsenate 
June 28. 
(powder), 2 lbs. laun- 
dry soap, 3-3-50 Bor- 
deaux (sprayed with 
trailer, coarse nozzle). 
2\ lbs. lead arsenate 
Aug. 4. 
(powder), 1 lb. resin 
soap, 3-3-50 Bor- 
deaux (sprayed with 
trailer, coarse nozzle) 9 . 
1 Concord. 
3 Samples washed in running tap water. 
•> Harvested Oct. 27, 1915, North East, Pa. 
8 Harvested Sept. 30, 1916, Benton Harbor. Mich. 
7 Harvested Oct. 6, 1916, North East, Pa. 
3 Catawba. 
9 Harvested Oct. 13, 1916, Sandusky, Ohio. 
