New YorK AGRICULTURAL EXPERIMENT STATION. 131 
three-fourths of their foliage making the contrast between the 
sprayed and unsprayed very striking. The unsprayed rows were 
so completely dried up that it was impossible to determine what 
had killed them; but the sprayed rows showed evidence of a 
severe attack of flea-beetles. On the sprayed rows adjacent to 
the unsprayed there was but little late blight although in some 
other parts of the field it was abundant. 
The test rows were dug on September 19. As usual, weights 
were taken on the middle unsprayed row and the second sprayed 
row on either side. The yields were as follows: 
Second sprayed row on the west, 997 Ibs. marketable tubers. 
Second sprayed row on the east, 949 Ibs. marketable tubers. 
Average of the two sprayed rows, 973 lbs. marketable tubers. 
Middle unsprayed row, 624 Ibs. marketable tubers. 
Yield per acre, sprayed. 298 bu. 3 lbs. marketable tubers. 
Yield per acre, unsprayed, 191 bu. 9 lbs. marketable tubers. 
Gain per acre, 106 bu. 54 lbs. marketable tubers. 
The yield of culls was at the rate of 1434 bushels per acre for 
the spraved area and 221-5 bushels for the unsprayed. 
The loss from rot was small on both the sprayed and the 
unsprayed rows. The increased yield on the sprayed rows was 
mostly due to longer growth of the vines. Flea-beetles, early 
blight and late blight were all factors in this experiment. Flea- 
beetles were especially destructive. Mr. Colyer states that he 
has rarely known them to be so numerous and that they seemed 
to be worse in his field than in most other fields in the vicinity. - 
These troublesome little insects are scarcely affected by poisons 
applied in the ordinary way, but by spraying very thoroughly with 
bordeaux mixture and paris green their ravages may be greatly 
reduced. In this experiment they caused considerable damage 
to the sprayed rows in spite of the spraying, while the unsprayed 
rows were ruined by them. 
The items of expense of spraying 14 acres seven times in the 
Woodbury experiment are as follows: 
630 pounds copper sulphate, at 534c................. $36 23 
ema Rett Op OTe re ge ae rie a kas)’. st vig’ elt pss no 2g ualstms 2 80 
Meee SP Ile eT Lt, Gia asc ' satis sx onace ego! + « Suce.s 3 74 
MILOTI MUL TOO LOL Widihe LUO LOCe yy ng cine br cies oes sao sae 21-00 
