30 



BULLETIX 1027, U. S. DEPAETMEXT OF AGEKT'LTUEE. 



Table 12. — Copper, lead, and arsenic remaining on sprayed grapes at picking timc- 



Continued. 



Sam- 



Spray materia! used. 



Date 

 sprayed. 



Condition 

 of samples 

 analyzed. 



Arsenic 



(As). 



Lead(^b). %PP- 



Loss 



ple 

 No. 



Orig- 

 inal 

 fruit. 



Dried 

 fruit. 



Orig- 

 inal 

 fruit. 



Dried ?"g- 



Dried 

 fruit. 



dry- 

 ing. 



2888412 

 288868 

 28887" 



3-3-50 Bordeaux 

 (sprayed with set 

 nozzle). 



2i lbs. lead arsenate 

 (powder), lib. resin 

 fish-oil soap, 2-3-50 

 Bordeaux, (sprayed 

 with trailer, medium 

 nozzle) .13 



3-3-50 Bordeaux 

 (sprayed with set 

 nozzle). 



IJ lbs. lead arsenate 

 (powder), 1 lb. resin 

 fish-oil soap, 2-3-50 

 Bordeaux (sprayed 

 with trailer, medium 

 nozzle) .11 



3-3-50 Bordeaux 

 (sprayed with set 

 nozzle). 



1 lb. calcium arsenate 

 (powder), 1 lb. resin 

 fish-oil soap, 2-3-50 

 Bordeaux (sprayed 

 with trailer, medi'um 

 nozzle)." 



3-3-50 Bordeaux 

 (sprayed with set 

 nozzle) .11 



3-3-50 Bordeaux 

 (sprayed with set 

 nozzle)." 



1917. 

 June lS-20. 



July 2-4. 24- 

 25. 



June 18-20. 



Julv 2-4, 

 Aug. 14. 



June 18. 



July 2-4, 24- 

 25. 



June 18-20. 

 June 18-20. 



Unwashed . 

 Washed w. . 



Unwashed . 

 Washed 10.. 



Unwashed . 

 Washed !».. 



Unwashed . 

 Washed".. 



Unwashed . 

 Washed i» 



5.70 

 4.40 



5.90 

 1.30 



4. 60 



P 

 31.10 

 24.00 



30.30 

 6.70 



24.30 



%rts pe 

 13.0 

 12.0 



14.8 

 3.9 



r miliio 

 71.0 

 65.6 



75.9 

 20.0 



n. 

 4.3 

 3.3 



2.3 

 1.7 



6.4 

 4.2 



1.5 

 1.3 



1.5 



1.5 



23.5 

 18.0 



11.8 



8.7 



33.8 

 22.2 



7.6 

 6.6 



7.6 

 7.6 



P.cl. 

 81.7 



80.5 



81 1 





1. 80 9- .50 









28888S 

 2888912 



.08 

 .08 



.08 

 .08 



.40 



.40 



.40 

 .40 



.9 

 .9 



. 5 

 .3 



4.5 

 4.5 



2.5 

 1.5 



80.2 

 80.2 



8 Catawba. 



10 Samples washed by soaking the grapes in water for 5 minutes, pouring o3 the water, and then wash- 

 ing in running tap water. 



11 Harvested Oct. 27, 1917, Sandusky. Ohio. 

 11 Ives. 



"Harvested Oct. 18, 1917, Sandu.sky, Ohio. 



WEATHER COXDinONS. 



Nos. 23565-67: Ideal for spraymg during both applications; all fohage and fruit were covered. 



Nos. 23571-74 and 23683-90: Heavy rain on July S, which seemed to wash off a large amount of the spray 

 material. 



Nos. 25836-3S and 25903-07: No abnormal weather conditions reported. 



Nos. 26016-21: Dry, hot, clear: season unusually drj-. 



Nos. 2&SS1-S9: 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 harrest. 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. 



