236 Report of the Botanical Department of the 



the cassville experiment. 



Conducted by P. S. Doolittle, Cassville, N. Y. The experiment 

 field contained six acres of potatoes (variety Carman No. 3), 

 which were sprayed five times with a two-horse, seven-row Brown 

 sprayer, carrying one nozzle per row. The check consisted of a 

 strip of seven nnsprayed rows 681 feet long. On either side of the 

 check a strip of seven rows was double-sprayed as shown in the dia- 

 gram on the opposite page. The bordeaux used was of the 5-5-50 

 formula. Paris green (1^ lbs. to 50 gals.) was used with the 

 bordeaux in the first two sprayings. On the same dates (July 8 

 and 20), the check rows were treated with the same quantity of 

 paris green applied with water. Tip burn was severe and there 

 were some flea beetles, but both early and late blight were absent 

 and there was no rot. Considering that there was no blight and 

 that the plants were killed by an early frost on September 14 the 

 large difference in yield between sprayed and unsprayed rows is re- 

 markable. However, the experiment seems to have been a fair 

 one in all respects. 



The items of expense were as follows : 



175 lbs. copper sulphate @ 5^4 cts $9 63 



180 lbs. lime @ 1% cts 2 25 



22 Ib^. paris green @ 22 cts 4 84 



2iy2 hrs. man labor @' 20 cts 4 30 



18 hrs. labor for team @ 20 cts 3 60 



Wear of sprayer 6 00 



Total $30 62 



Expense per acre, for five sprayings, $5.10. 



The accompanying diagram shows the location of the test rows 

 with reference to each other. They are indicated by dotted lines 

 and followed by their yield. 



