96 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 9 



Poison Fungicide and Sticker 



Paris green Bordeaux and soap 



Arsenite of soda Bordeaux and soap 



Arsenate of lead Bordeaux and soap 



Paris green Bordeaux and soap 



Arsenite of soda Bordeaux and soap 



Arsenate of lead Bordeaux and soap 



Single machine sprayings failed to give results largely because 

 enough spray did not reach and cling to the grape bunches to be 

 effective. These sprayings were made about June 20 to 22 and July 

 8 to 12. The various spreaders and stickers used with 3 pounds of 

 arsenate of lead paste gave results as follows: 



Per cent 

 Wormy 



Bordeaux and iron sulfate 10.18 



Bordeaux only 8 . 57 



Bordeaux and soap 7.9 



Bordeaux and resin soap 4.47 



Hand-sprayed, Bordeaux and laundiy soap 2.9 



Unsprayed 58 . 3 



The spray was applied at a pressure of 70 to 90 pounds and double 

 sprayed with fixed spars, excepting the hand-sprayed plot. 



In 1908 similar experiments w^ere made by the author under Pro- 

 fessor Gossard's direction, at Euclid, O. Comparing single and double 

 machine-sprayed plots and hand-sprayed plots, some differences are 

 shown : 



Per cent 

 Wormy 



Single machine sprayed 21.5 



Double machine sprayed 10.4 



Hand-sprayed (with soap) .71 



Double macliine spi-ayed (with soap) 4 .67 



Unsprayed 47 .00 



Arsenate of lead 3 pounds to 50 gallons of 3-6-50 Bordeaux was used 

 in these tests with 1 pound of dissolved laundry soap as a sticker and 

 spreader where soap was added. The spray was applied with a trac- 

 tion machine at 60 to 90 pounds pressure. Straight spars with the 

 nozzles pointing at right angles to the row of grape vines were used in 

 the machine work. 



In 1907 and 1908 the applications of spray were made just before 

 the grapes bloomed, again about June 18 to 22, and the 10th to 15th 

 of July, when three sprayings were given. 



