28 



BULLETIN 1027, U. S. DEPARTMENT OF AGRICULTURE, 



Table 12. ^Copper, lead, and arsenic remaining on sprayed grapes at picking time- 

 Continued. 



Sam- 

 ple 

 No. 



25836 1 

 258371 

 258381 



25903' 

 25904 1 



Spray material used. 



3 lbs. lead arsenate 

 (paste), 1 lb. laundry 

 soap, 3-3-50 Bor- 

 deaux (spray applied 

 with fine nozzles set 

 at rear of sprayer).^ 



Check plat (unsprayed)^ 



1 gall. lime-sulphur, 33^ 

 B.),7 galls, water. 



4-4-50 Bordeaux s 



8 lbs. Bordeaux (com. 

 paste), I lb. lead arse- 

 nate (powder), 50 

 galls, water. 



8 lbs. Bordeaux (com. 

 paste) , 50 galls .water.s 



Check plat (unsprayed)' 



1 lb. soap, li lbs. lead 



arsenate (powder), 



3-3-50 Bordeaux 



(used trailers with 



medium nozzles).' . 

 259051 1 lb. soap, 2|lbs. lead do... 



arsenate (powder), 



3-3-50 Bordeaux 



(used trailers with 



medium nozzles).' 

 259061 I lb. soap, 2^ lbs. lead do 



arsenate (powder), 



3-3-50 Bordeaux 



(used trailers with 



medium nozzles). 

 1 lb. lime, 1 lb. soap, 2A Aug. 12. 



lbs. lead arsenate 



(powder), 50 galls. 



water (double appli- 

 cation).' 

 25907 1 1 lb. soap, 11- lbs. lead July 6, 21. 



arsenate (powder), 



3-3-50 Bordeaux 



(used trailers with 



fine nozzle).' 



26016 8 4-3-50 Bordeaux (me- June 15. 

 diumset nozzle).' 



26017 8 4-3-50 Bordeaux (me- do... 



dium set nozzle). 



2;} lbs. lead arsenate June 28. 

 (powder), 2 lbs. laun- 

 dry soap, 3-3-50 Bor- 

 deaux (sprayed with 

 trailer, fiiie nozzle). 



24 lbs. lead arsenate 

 (powder), 1 lb. resin 

 soap, 3-3-50 Bor- 

 deaux (sprayed with 

 trailer, fine nozzle) .' 



26018 8 4-3-50 Bordeaux (me- June 15. Unwashed, 

 dium set nozzle). Washed ' 



2i lbs. lead arsenate June 28. 

 (powder), 2 lbs. laun- 

 dry soap, 3-3-50 Bor- 

 deaux (sprayed with 

 trailer, coarse nozzle). 



2i lbs. lead arsenate Aug. 4. 

 (powder), 1 lb. resin 

 soap, 3-3-50 Bor- 

 deaux (sprayed with 

 trailer, coarse nozzle)'. 



1 Concord. 



s Samples washed in running tap water. 



5 Harvested Oct. '-'7, 1915, North East, Pa. 



6 Harvested Sept. 30, 1916, Benton Harbor, Mich. 



Date 

 sprayed. 



1915. 

 July 5, 17. 



1916. 

 Dormant 



spray. 

 June 16. 

 June 1, 12. 



Aug. 2. 

 July 6, 21. 



Condition 

 of samples 

 analyzed. 



Unwashed 

 Washed s . 



Unwashed 

 Washed ' . 



Unwashed 

 Washed s . 



Unwashed 

 Washed s . 



Unwashed . 

 Washed ' . . 

 Unwashed . 

 Washed ^ . . 



Unwashed . 

 Washed 3 . . 



Unwashed . 

 Washed 3 . . 



Unwashed . 

 Washed s... 



Unwashed . 

 Washed 3... 

 Unwashed . 

 Washed 3... 



Arsenic 



(As). 



Orig- 

 inal 

 fruit. 



Dried 

 fruit. 



Lead (Pb). 



Orig- 

 inal 

 fruit. 



Dried 

 fruit. 



Copper 



icu). 



Orig- 

 inal 

 fruit. 



Dried 

 fruit. 





Parts per miUu 



n. 



0.29 



1.40 



0.9 



4.3 



0.6 



.22 



1.00 



.4 



1.9 



.3 



.0 



.0 



.5 



2.6 



.9 



.0 



.0 



.5 



2.6 



.6 



.05 



.26 



.7 



3.6 



1.1 



.02 



.10 



.6 



3.1 



1.1 



.12 



.63 



.8 



4.2 



1.4 



.07 



.37 



.6 



3.2 



1.1 



.04 



.17 



.6 



2.6 



.8 



.04 



.17 



.6 



2.6 



.4 



3.00 



12.60 



7.5 



31.6 



4.1 



1.00 



4.20 



3.5 



14.8 



1.4 



.70 



3.20 



3.9 



17.7 



2.1 



.60 



2.70 



2.8 



12.7 



1.3 



3.80 



16.10 



12.0 



50.8 



3.2 



2.60 



11.00 



7.6 



32.2 



1.7 



.30 



1.30 



2.4 



10.3 



2.3 



.30 



1.30 



1.3 



5.6 



1.5 



.15 



.60 



.7 



2.9 



2.0 



.15 



.60 



.7 



2.9 



1.3 



1.80 



7.30 



5.1 



20.7 



2.7 



.70 



2.80 



2.1 



8.5 



1.5 



3.70 



16.30 



10.4 



45.8 



3.4 



.90 



4.00 



3.1 



13.7 



1.4 



2.9 

 1.4 



4.7 

 3.2 



5.6 

 5.6 



7.4 

 5.8 



3.4 



1.7 



17.3 



5.9 



9.5 

 5.5 



13.6 



7.2 



9.8 

 6.5 



8.3 

 5.4 

 11.0 

 6.1 



15.0 

 6.2 



' Harvested Oct. 6, 1916, North East, Pa. 



8 Catawba. . 



9 Harvested Oct. 13, 1916, Sandusky, Ohio. 



