New YorK AGRICULTURAL EXPERIMENT STATION. 179 
BORDEAUX WITH ARSENITE OF SODA VS. BOR- 
DEAUXSALONE. 
In an experiment made at this Station in 1904 potato rows 
sprayed with bordeaux mixture containing arsenite of soda as 
poison yielded 34 bushels per acre less than rows sprayed with 
bordeaux mixture alone.*® As there was no apparent injury to the 
foliage this reduction in yield was attributed to unequal conditions 
in the. experiment rather than to the arsenite. However, it was 
deemed advisable to make the following experiment in 1905: 
In a plat of 58 rows 108 feet long every other row was sprayed 
five times with bordeaux and arsenite of soda (one quart of stock 
solution™ to 50 gallons), while the alternating 29 rows were sprayed 
with bordeaux only. As in the paris green experiment, care was 
taken to have the bordeaux of uniform character and uniformly 
applied. (At the rate of 100 to 300 gallons per acre in the different 
sprayings.) The bordeaux was made by the 1-to-84% formula with 
lime in moderate excess of the quantity required to satisfy the 
potassium ferro-cyanide-test. The frequent and thorough spray- 
ing kept the bugs so well under control that but one hand picking 
was required even on the bordeaux-only rows.?? About July 20 
all of the rows were slightly injured by bugs, but so far as could 
be determined there was no more damage to the bordeaux-only 
rows than to those receiving the arsenite. The dates of spraying 
were July I, 6-7, 20, August 4-5 and 21-22. 
* Reported in Bulletin 267, pages 278-284. 
* Prepared by the Kedzie formula as follows :— 
A CIS re mi eee AN Oe Sas Ot wie koe nda © ce nuns pounds 2 
SE erg a he cee! oats Sire tiated cece sic t ciee's Ma peewee aon pounds 8 
Ch UES sh Ne. cay Shure gaye ea ae ae ilu PS Be SOE 0 ee ee oe eos gallons 2 
Boil until the arsenic is all dissolved which will take about 15 minutes. 
* The second spraying made July 6 and 7 was entirely successful in de- 
stroying swarms of young bugs as in the paris green experiment (See foot- 
note No. 31 on page 177. Even on the bordeaux-only rows, so few bugs 
survived that it was thought unnecessary to remove them by hand picking. 
However, by July 18 quite a good many bugs were in evidence, many of 
them being half-grown slugs. Having in mind our previous success we had 
little doubt that the bugs could be managed by spraying. By accident, the 
first rows which should have been sprayed with bordeaux and arsenite were 
sprayed with bordeaux only. This error made it necessary to spray the 
