48 STORRS AGRICULTURAL EXPERIMENT STATION. 
& 
SPRAYING NOTES FOR 1904-1905. 
BY -H.oR. BRENNA IL: 
e+e ——_- 
Bordeaux mixture as a remedy for late blight of potatoes has 
been used for several years with varying degrees of success. 
During the seasons of 1903, 1904, and 1905, the potato fields 
at the Connecticut Agricultural College were sprayed with 
Bordeaux mixture, the work being done with an automatic 
horse-power spray cart. The results from this work, like those 
obtained at many other places, were not all that could be de- 
_ sired. An increase in yield per acre was obtained, but rotting 
of the tubers was not prevented. 
In the spring of 1904 an experiment was started at the Storrs 
Agricultural Experiment Station to deterime if late blight and 
the consequent rotting of the tubers could be prevented by 
application of Bordeaux mixture. 
A plot of ground was planted May 11 with Green Mountain 
potatoes. Cultivation was begun as soon as the plants were up 
and was continued until the vines covered the ground. Appli- 
cations of Bordeaux mixture were made on three of the six 
equal rows on the following dates:—June 1, 11, 18, July 2, 9, 
13, 25, 30, August 6, 19, and 30. July 2 and July 13 Paris 
' green was added to the Bordeaux mixture. The check rows 
were sprayed four times with Paris green. 
¥ 
RESULTS. 
Until August 30 little difference could be noticed between 
the sprayed and the unsprayed rows, with the exception that 
the work of the striped beetle and black flea beetle were much 
more in evidence on the unsprayed than on thé sprayed vines. 
At this time the unsprayed plot began to have an appearance 
of ripening. Investigation showed the presence of early blight. 
September 13 both early and late blight were found on the 
plants, and the leaves were practically dead on the whole un- 
