ORCHARD SPRAYING EXPERIMENTS II. 9 



The home made Hme sulphur concentrate registered 27 de- 

 grees Beaume density. This, according to Van Slyko et al.* 

 should be used at a summer strength of i gallon to 29.5 gal- 

 lons of water, or 1.69 gallons of concentrate for 50 gallons of 

 spray. In the Highmoor experiment, therefore, i 2-3 gallons 

 was used upon the block to be sprayed with the recommended 

 "standard" dilution. Two other blocks of equal size were 

 sprayed with the same concentrate at dilutions of 2 gallons to 

 50 and I 1-4 gallons to 50 respectively, or 20 percent stronger 

 and 25 percent weaker, ■ respectively, than the standard given 

 according to the dilution table.** 



The remaining portions of the experimental plot were di- 

 vided into three parts. Two of these were treated sim.ply with 

 arsenate of lead, at 2 and 4 pounds to 50 gallons of water, 

 respectively ; the other was sprayed with the 3-3-50 bordeaux 

 mixture plus 2 lbs. of lead arsenate. The lime-sulphur solu- 

 tions also included 2 lbs. of arsenate to 50 gallons of spray. 



All applications on all divisions of the plot were made with 

 the Niagara carbonic acid gas sprayer. 



The same block of Ben Davis trees used in 1910 served for 

 the work under discussion. It was divided and treated as indi- 

 cated in the following figure. 



Plan of Experime:nt. 











n 







n 











n 

















































n 







n 



n 







































t) 













n 



n 







































































n 































































n 







n 



























"0 























































































u 



u 











A 









B 











c 









D 







E 



F 



A. Arsenate of Lead, 4 lbs. to 50 gallons. 



B. Lime-sulphur, 2 to 50 gallons, +2 lbs. lead arsenate. 



C. Lime-sulphur, If to 50 gallons, +2 lbs. lead arsenate. 



D. Lime-sulphur, IJ to 50 gallons, +2 lbs. lead arsenate. 



E. Lead Arsenate, 2 lbs. to 50 gallons. 



F. Bordeaux mixture. 3-?-50 +2 lbs. lead arsenate. 



*Van Slyke, L. L., Bosworih, A. \V., and Hdcres. C. C. "Chemical 

 Tnvestio-ation of Best Crnditions for Making tlie T Jme-Sulplnir Wash." 

 N. Y. (Cereva) .ApT. Exp. Sta. Brl. 329, P- 438, Tab. XT. 



**The third application was made from a fresh stock solution repis- 

 tering- 24 degrees Beaume density, and was diluted on the above plan 

 for the three blocks. 



