30 
BULLETIN 1027, IT. S. DEPARTMENT OF AGRICULTURE. 
Table 12. — Copper, lead, and arsenic remaining on sprayed grapes at picking time — 
Continued. 
A rsenic 
(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. 
1917. 
Parts ver million. 
P.ct. 
2888412 
3-3-50 Bordeaux 
June 18-20. 
Unwashed . 
5. 70 31. 10 
13.0 
71.0 
4.3 
23.5 
81.7 
(sprayed with set 
Washed w. . 
4.40 24.00 
12.0 
65.6 
3.3 
18.0 
nozzle). 
2i lbs. lead arsenate 
July 2-4. 24- 
(powder), 1 lb. resin 
25. 
fish-oil soap, 2-3-50 
Bordeaux, (sprayed 
with trailer, medium 
nozzle). 13 
28886* 
3-3-50 Bordeaux 
June 18-20. 
Unwashed . 
5.90 30.30 
14.8 
75. 9 
2.3 
11.8 
80.5 
(sprayed with set 
nozzle). 
1£ lbs. lead arsenate 
Washed w.. 
1. 30 6. 70 
3.9 
20.0 
1.7 
8.7 
July 2-4, 
(powder), 1 lb. resin 
Aug. 14. 
fish-oil soap, 2-3-50 
Bordeaux (sprayed 
with trailer, medium 
nozzle). 11 
• 
28887" 
3-3-50 Bordeaux 
(sprayed with set 
June 18. 
Unwashed . 
Washed 1 ".. 
4.60 24.30 
1. 80 9. 50 
6.4 
4.2 
33.8 
22.2 
81.1 
nozzle). 
1 lb. calcium arsenate 
July 2-4, 24- 
(powder), 1 lb. resin 
25. 
fish-oil soap, 2-3-50 
Bordeaux (sprayed 
with trailer, medium 
nozzle). 13 
28888* 
3-3-50 Bordeaux 
June 18-20. 
Unwashed . 
.08 
.40 
.9 
4.5 
1.5 
7.6 
80.2 
(sprayed with set 
Washed 1 '.. 
.08 
.40 
.9 
4.5 
1.3 
6.6 
nozzle). 11 
28889 12 
3-3-50 Bordeaux 
June 18-20. 
Unwashed . 
.08 
.40 
.5 
2.5 
1.5 
7.6 
80.2 
(spraj'-ed with set 
Washed w 
.08 
.40 
.3 
1.5 
1.5 
7.6 
nozzle). 13 
8 Catawba. 
" Samples washed by soaking the grapes in water for 5 minutes, pouring off the water, and then wash- 
ing in running tap water. 
11 Harvested Oct. 27, 1917, Sandusky, Ohio. 
" Ives. 
" Harvested Oct. 18, 1917, Sandusky, Ohio. 
WEATHER CONDITIONS. 
Nos. 23565-67: Ideal for spraying during both applications; all foliage and fruit were covered. 
Nos. 23571-74 and 23688-90: Heavy rain on July 8, which seemed to wash off a large amount of the spray 
material. 
Nos. 25836-38 and 25903-07: No abnormal weather conditions reported. 
Nos. 26016-21: Dry, hot, clear; season unusually dry. 
Nos. 28881-89: Rainfall normal: in no case did rain interfere with the spraying, nor did rain fall before 
material was well dried. 
The Michigan samples and the Pennsylvania samples mentioned in 
Table 12 that were sprayed according to normal schedule showed 
very little spray residue at harvest. Grapes sprayed in Sandusky, 
Ohio, according to the schedule formerly used in that region showed 
a decided spray residue on their surface at harvest. As this spray 
residue was no doubt due mainly to late spraying, the Bureau of 
Entomology has recommended a new schedule which is given under 
Sample 28881. Table 12 shows the composition of grapes sprayed 
according to the recommended schedule as compared with that of 
those sprayed under the schedule formerly used, as well as the com- 
position of grapes sprayed under various experimental schedules. 
