SOLUBIvE BORDEJAUX FOR POTATO BLIGHT. II 



Plot D. Twelve rows (one acre) next north were treated 

 with soluble Bordeaux equivalent to ^ pounds of sulphate of 

 copper per acre each application. 



Plot E. Twelve rows (one acre) next north were sprayed 

 with the regular Bordeaux mixture. 



DATES OF SPRAYING AND NOTES. 



July 8. (The soluble Bordeaux experiment had not at this time been 

 plawned.) The whole field was sprayed with regular Bordeaux mixture. 

 The plants were in early bloom. 



July 15. Plots A and E sprayed with 2-3 pound Paris green and 3 

 pounds lime. Plots B, C and D sprayed in both directions with soluble 

 Bordeaux and 2-3 pound Paris green. 



July 22. Plots A and E sprayed in both directions with regular Bor- 

 deaux mixture and 2-3 pound Paris green per acre. Other plots sprayed 

 as the isth. 



July 27. All plots sprayed on the 22d, except that no Paris green was 

 used. 



July 29. All plots in fine shape. No signs of disease. 



August 5. Potatoes in full bloom. No signs of blight. Very few 

 rumors of any blight in the county. 



August 10. All plots sprayed as before, but without Paris green. 



August 13. Quite a few plant lice on some plants on all the plots. 



August 20. Possibly a little blight on soluble Bordeaux plots. 

 Plant lice are doing some damage. 



September i. Quite a heavy frost. But little damage on this field. 



As will be observed from the notes, this field was sprayed only 

 4 times, or about half the number that is desirable. As it proved 

 in this particular year, it was apparently sufficient to keep off 

 blight and rot. At digging there was no sign of rot upon the 

 potatoes from the plots treated with regular Bordeaux mixture, 



YiElvDS. 



Through a misunderstanding, the potatoes on plot E were dug 

 in the absence of a Station representative, and while the yield 

 was taken, it is so much larger than that on the other plots that 

 it may have been an error. There were so few small potatoes 

 and practically no rotten ones that no separation was made in 

 the field. 



Yield plot A, regular Bordeaux, 103 barrels. 



Yield plot B, soluble Bordeaux 27^ pounds copper sulphate, 

 102 barrels. 



