132 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
THE GOWANDA EXPERIMENT. 
This experiment was made by E. T. Ryder, Gowanda, Catta- 
raugus county. Ten acres of potatoes, variety Rural New York 
No. 2, were sprayed with bordeaux and paris green four times on 
the following dates: ‘June 28 and 20, July 7 and 8, July 14 and 15 
and August 2 and 3. The spraying outfit used consisted of a one- 
horse, home-made, two-wheeled cart carrying a Spramotor barrel 
spray pump and a Spramotor potato spraying attachment rigged to 
cover three rows at a time with four nozzles per row. (See Plate 
III, fig. 1). The pumping was done by the driver. Water for 
niaking the bordeaux was conveniently obtained from a small 
stream at one end of the field. 
Six rows 1150 feet long were left unsprayed. These rows were 
treated four times with paris green in water applied with the 
sprayer on the same dates that bordeaux and paris green were ap- 
plied to the sprayed portion of the field. Bugs were kept well under 
control on the sprayed and unsprayed rows alike. 
The items of expense of spraying the ten acres four times were 
as follows: 
216". “‘Ibs,- copper sulphate .@ 15540122... s.9.s te oe ee eee ee $11.88 
174. bb lime Siri soe veces les Sone ds ee 1.50 
4% gals. stock solution of arsenite of soda @ I6c.............. “72 
14 of lbsa:paris: greem, G)250:", ©... cons ee Ee ee pe 3.50 
30) hrs: dabor fOr: man“) tStsina. eekces vce el eee ee 12.00 
40, Pts. labGr- Or MOVs i eeCr. «ert es ee ee ace 3.00 
Wear on spraying outht so ooc. es Pu. tac ae ee 5.00 
Aisle loner, PRET IS. for ctr rl ee? py $37.60 
The total cost of spraying was $3.76 per acre or 94 cents per acre 
for each application. 
As late as July 28 there was no apparent difference between 
the sprayed and unsprayed rows. During August late blight 
attacked the unsprayed rows causing considerable damage. 
Before the plants were killed by frost, on September 14, there 
was a marked contrast between the sprayed and unsprayed rows. 
The test rows were dug and weighed October 6. Owing to lack 
of time only 500 feet of the rows was dug. The rows used for 
comparison were one of the middle two unsprayed rows, the second 
