186 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
during the past season was certainly due to Phytophthora infestans 
and might have been largely prevented by thorough spraying. In 
this connection we wish to emphasize the importance of more 
thorough spraying in the latter part of the season as a safeguard 
against rot. 
MAKING EXPERIMENTS IN 1906. 
During the season of 1906 the work on potato spraying will 
be carried forward along practically the same lines as in 1904 and 
1905. The regular ten-year experiments at Geneva and River- 
head will be conducted again as usual; also, about fifteen farmers’ 
business experiments in different parts of the State. In addi- 
tion the Station hopes to secure again, as in the past, reports of | 
numerous volunteer experiments—the more the better. Potato 
growers throughout the State are earnestly requested to make 
spraying experiments in 1906 and report the results to the Station. 
Whatever the outcome of the experiments, whether for or against 
spraying, the reports are desired provided, of course, the experi- 
ments have been properly conducted. Upon request, the Station 
will supply blanks for making such reports. 
DIRECTIONS: FOR SPRAYING= 
In general, commence spraying when the plants are six to eight 
inches high and repeat the treatment at intervals of Io to 14 days 
in order to keep the plants well covered with bordeaux throughout 
the season. During epidemics of blight it may be necessary to spray 
as often as once a week. Usually six applications will be required. 
The bordeaux should contain six pounds of copper sulphate to each 
50 gallons.® Whenever bugs or flea beetles are plentiful add one 
to two pounds of paris green or two quarts of arsenite of soda stock 
solution (See footnote, p. 179) to the quantity of bordeaux re- 
quired to spray an acre. 
Thoroughness of application is to be desired at all times, but 
is especially important when flea beetles are numerous or the 
* Substantially the sdme as given in Bulletin 264, p. 204. The experiences 
of the past season do not warrant any material alteration in the recommend- 
ations there made. 
” For the preparation of bordeaux mixture see Bulletin 243 of this Station. 
