84 Report or THE BOTANIST OF THE 
DATES OF SPRAYING. 
At Geneva: Series I.— This series, consisting of rows 1, 4, 7, 10 
and 13, was sprayed three times with bordeaux mixture — July 
10, 23 and August 12. The applications were made at such 
times as they were most needed. It was impossible to delay 
the first application longer than July 10, because at that time 
large numbers of “ bugs 4 had commenced to feed, and unless 
these had been killed at once they would have done great 
damage. To kill the “ bugs,” paris green was added to the bor- 
deaux mixture at the rate of 10 ounces to 50 gallons. The treat- 
ment was entirely successful. Five days later there was 
scarcely a living “ bug” to be seen. 
It was thought advisable to make the second spraying on July 
23, because during the preceding week there had been frequent 
showers and the weather seemed favorable to blight. In fact, 
the occurrence of late blight (Phytophthora) had already been re- 
ported from Delhi (July 15) and Ilion (July 21). In this second 
spraying bordeaux alone was used. 
Late blight made its first appearance in the experiment field 
on July 28 At this time the disease was already epidemic 
among early potatoes at Geneva, Seneca Falls and other places 
in central New York; but it was not yet common among late 
potatoes, and in the experiment field it made slow progress 
even on the unsprayed rows. 
The third and last spraying was made August 12 with bor- 
deaux alone. 
Series II.— This series consisted of rows 2, 5, 8, 11 and 14. It 
was the intention to spray it according to the directions usually 
given for spraying potatoes; namely, “Commence spraying when 
the plants are six to eight inches high and repeat the treat- 
ment at intervals of 10 to 14 days as long as the plants remain 
green.” 
In all, seven sprayings were made, as follows: June 25, July 
10, 23 and 30, August 12 and 26, and September 10. Paris green 
4The word ‘“‘bugs’”’ as used throughout this bulletin refers to the striped Colorado potato 
beetles, Doryphora decemlineata. Properly speaking these insects are beetles, not bugs, 
but to farmers they are known as ‘“‘bugs.”” Moreover, ‘‘bugs” is a shorter name and for that 
reason it will be used in this bulletin. 
