New York AGRICULTURAL EXPERIMENT STATION. 95 
DATES OF SPRAYING. 
At Geneva: Series I[.—The rows of this series, 1, 4, 7, 10 and 
13, were sprayed three times with bordeaux mixture—July 18, 
27 and August 15. At the time of the first spraying bugs* 
had not yet done appreciable damage, but they were becoming 
very numerous and it was believed that treatment could not be 
longer delayed with safety. To poison the bugs paris green was 
added to the bordeaux at the rate of one pound to 50 gallons. 
At this time the plants were 12 to 14 inches high and eee 
rapidly. 
Although the first spraying was effective in ridding the plants 
of bugs a second spraying, on July 27, was necessitated by the 
appearance of a second crop of them. This time paris green was 
used at the rate of one-half pound to 50 gallons of bordeaux. 
The treatment was effective and there was no further trouble with 
bugs. Probably, this second spraying was very useful in pre- 
venting the early attack of blight. Traces of blight had been 
found on the unsprayed rows the day before. 
The third and last spraying on this series was made August 15 
with bordeaux alone. Spraying could not be longer delayed 
because blight was already well established on the unsprayed 
rows and even on the rows of this series there was an occasional 
leaf affected. Moreover, the plants were almost entirely unpro- 
tected. All traces of the previous spraying had disappeared, the 
bordeaux having been washed off by heavy rains and there was 
also a large amount of unprotected new growth. 
Series [J7.—This series consisted of rows am 5, 8, 11 and 14. 
The plants were sprayed five times—July 8, 22, August 1, 15 and 
29. At the time of the first spraying the plants were 6 to 8 
inches high. On this series it was thought advisable to use 
poison three times.® In the first two sprayings it was needed 
because of bugs and in the third spraying it was used because an 
outbreak of flea-beetles was expected. The principal part of the 
first crop of bugs appeared about July 12. As the first applica- 
tion of poison was made July 8 many of the bugs escaped it with 
®¢ Throughout this bulletin the word “bugs” refers to the Colorado potato 
beetle, Doryphora decemlineata. 
*In the first spraying, arsenite of soda—one pint of stock solution to 50 
gallons; in the second and third sprayings, paris green—one-half pound to 
50 gallons. 
