174 Report OF THE BoTANICAL DEPARTMENT OF THE 
The test rows were in a two-acre field which was dug after the 
vines were dead, but before the time when potatoes rotted badly. 
In this field there was practically no rot on either the sprayed or 
unsprayed rows. The remaining ten acres were dug later, after 
the rot epidemic, and the loss from rot was estimated at 40 to 50 
bushels per acre. As unsprayed fields in the same vicinity did 
not rot to any extent Mr. Foster believes that his actual gain from 
spraying was not as great as the yield of the test rows indicate. 
For further discussion of this experiment see page 185. 
The writers take this opportunity to heartily thank the gentle- 
men who have furnished the reports of their volunteer experiments 
for publication. Potato growers throughout the State are under 
obligations to them. 
SODA BORDEAUX VS. LIMF BORDEAUX. 
It has been stated that soda bordeaux is superior to lime bor- 
deaux for spraying potatoes, but experiments of the past two years 
show that this is probably not true. In an experiment made by 
this Station in 1904 lime bordeaux gave better results by 16% 
‘bushels per acre.*® Another experiment in 1905 resulted in a 
difference of nine bushels per acre in favor of lime bordeaux. The 
latter experiment included fifteen rows each 290% feet long. Five 
were sprayed four times with soda bordeaux (made with six pounds 
of copper sulphate and seven and one-half pounds of sal soda to 
50 gallons), five with lime bordeaux (6-4-50 formula) and the 
other five were not sprayed. The sprayed and unsprayed rows 
alternated as in the ten-year experiment. The spraying was done 
with a knapsack sprayer and very thoroughly by going over each 
row twice—out on one side and back on the other. The dates of 
spraying were June 30, July 10, August r and 2, and August 23. 
In the first three sprayings paris green was used with both kinds of 
bordeaux and on the same dates the unsprayed or check rows were 
treated with the same quantity of paris green in lime water.?9 
*For details of this experiment see Bulletin 264, pages 187-104. 
* Ten ounces of paris green to 50 gallons in the first spraying and one 
pound to 50 gallons in the second and third sprayines 
