New YorRK AGRICULTURAL EXPERIMENT STATION. 97 
THE RESULTS OF THE TEN-YEAR EXPERIMENTS. 
AS INDICATED BY THE CONDITION OF THE FOLIAGE. 
At Geneva.—The only damage done by potato bugs was a slight 
injury to the plants in Series II between the first and second 
Ssprayings. Flea-beetles were almost entirely absent. About 
August 1 a few appeared but the damage done by them was inap- 
preciable. There was no early blight, Alternaria solani. On 
July 19 many of the plants in all three series showed a few leaves 
with dead, brown tips. ‘Yhis was attributed to sunscald brought 
about by several bright, hot days following a period of cloudy, 
wet weather. No material damage was done. Twice during the 
season the ground became hard and dry and more rain would 
probably have been beneficial, but it can scarcely be said that the 
plants were at any time injured by drought. 
The only important disease in the experiment field last season 
was late blight caused by the parasitic fungus, Phytophthora in- 
festans; and the remarkable difference in yield between sprayed 
and unsprayed rows is to be attributed almost entirely to the 
greater ravages of blight and rot on the unsprayed rows. 
The first discovery of late blight in the experiment field was 
made July 25. On that date a half hour’s search revealed nine 
affected leaves—seven on unsprayed plants and two on sprayed. 
During several days following there were frequent showers and 
the disease soon became thoroughly established. 
By August 9 the unsprayed rows (Series III) were already con- 
siderably blighted. In several places many lower leaves were 
dead and dry giving the plants the “trimmed-up” appearance 
characteristic of plants affected with late blight. Four days later 
one-third of the foliage on the unsprayed rows was ruined by 
blight and on August 29 it was estimated that, on an average, 
fully three-fourths of the foliage was dead, leaving the stalks 
with only tufts of green leaves at their tips. At the same time 
the plants on the sprayed rows (Series I and IL) were in almost 
full foliage, the leaves being green and perfect clear down to the 
ground. There seemed to be no difference between rows sprayed 
three times (Series I) and rows sprayed every two weeks (Series 
II). On both series there were traces of blight all along the 
rows, but not enough to affect growth materially. 
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