New YorK AGRICULTURAL EXPERIMENT STATION. lil 
first spraying. It appears that even this application was unneces- 
sary; for the unsprayed rows, which received no poison at all, 
were entirely uninjured by bugs. 
The soil was a sandy loam in a high state of fertility. Having 
good care and cultivation, aud an abundance of fertility the 
plants made a rank growth completely covering the ground. 
Under such conditions some would hesitate to spray fearing to 
injure the vines by driving over them. Note the results in this 
experiment. 
On August 18, when the experiment was first examined by 
one of the writers, many of the lower leaves on the unsprayed 
plants were already attacked by late blight, Phytophthora infes- 
tans. There were also traces of the disease among the sprayed 
plants. 
At the time of our second visit, September 7, there was a 
marked contrast between the sprayed and unsprayed rows. The 
latter had lost from one-half to three-fourths of their foliage 
while the adjacent sprayed rows on both sides were in full foliage 
with only traces of blight. On the under surface of almost 
every affected leaf the fine frost-like mildew around the margins 
of the diseased spots could be distinctly seen. This was an indi- 
cation that the fungus was in a state of active growth and in a 
condition to cause rapid destruction of the plants. 
Our third visit was made September 22. Now, the unsprayed 
rows were dead and dry clear across the field while the sprayed 
rows continued green in all parts of the field except a small area 
on the south side next the road. The three unsprayed rows 
appeared as a narrow brown streak extending across a field of 
green (See Plate VIII, fig. 2). It was a striking example of 
the benefit of spraying and no one who saw it could any longer 
doubt that spraying will prevent blight. Fortunately, a public ~ 
road ran along two sides of the field so that many persons had 
the opportunity of seeing the experiment. | 
On the night of September 22, there was a light frost which 
injured the plants some but did not kill them. When we saw 
the field for the last time on September 24 the sprayed plants 
were in fully as good condition as the unsprayed plants were on 
September 7; that is to say, the sprayed plants eutlived the 
~cunsprayed by at least 17 days. 
