134 Report of the Botanist of theI 



were treated with person to protect them against " bugs." In the 

 fall the tubers on such rows were carefully weighed and the yield 

 compared with that of the same number of adjacent sprayed rows. 

 The spraying and all work connected therewith was done by the 

 farmers themselves and in such manner as they thought best. That 

 is to say, these were farmers' business experiments. 



THE JAGGER EXPERIMENT. 



This experiment was made by H. A. Jagger, Southampton, Long 

 Island. Thirteen acres of potatoes were sprayed four times at a total 

 expense of $50.91 and the yield was thereby increased by 702 bushels 

 which were sold for $351. The net profit on the operation was 

 $300.09, which is at the rate of $23.08 per acre. 



The spraying was done with an outfit consisting of an Eclipse 

 No. 2 spray pmnp mounted in a lOO-gallon tank on a two-wheeled 

 cart hauled by one liorse (Plate XI). At each passage five rows 

 were sprayed with two nozzles per row. One man did both the 

 pumping and the driying. The original cost of the spraying outfit 

 was $42: Cart. $15: tank. $9; pump, $10; tubing and nozzles 

 about $8. 



Bordeaux mixture (i-to-8^ formula) was applied four times — 

 June 15, 27, July 15 and 21 — at the rate of about 47 gallons per acre 

 at each spraying. 



In the first three si)rayings paris greeu was added to the bordeaux 

 at the rate of two ])Ounds to 50 gallons. 



The thirteen acres consisted of two fields — one containing eight 

 acres and the other five acres. Both fields were on the same kind 

 of soil, sandy loam, fertilized and cultivated in the same way and 

 j)lanted with the same variety. Carman No. i, which is the most 

 popular variety in that section. The five-acre field was about 80 

 rods from the water supply but the eight-acre field was nearer. 



In the five-acre field one row 453 feet long was left uns])rayed. 



On this row paris green was applied twice with a Leggett jiowder 



