378 Kepoet of the Department of Entomology of the 



make this workable, improvements were needed, and the author 

 finally devised the machine with three booms with adjustable 

 nozzles. Mr. Morehouse and the author together then developed 

 the complete spraying attachment as shov^m. (Plates XXXIV- 

 XXXVII.) The machine when used with a pressure of 125-150 

 lbs. was very effective in killing the nymphs since between 80 and 

 90 per ct. of the foliage on dense vines was covered with a coarse 

 spray. This outfit is described as follows: 



AX AUTOMATIC GKAPE LEAF-HOPPER SPRAYIXG 



ATTACHMEXT. 



DESCRIPTION. 



The outfit consists of two frames, one placed on each side of a 

 vineyard sprayer (Plates XXXIV-XXXVII). Each frame (F, 

 Plate XXXVII) is more or less rectangular in shape and is 

 attached to the sprayer by three supports (S) which are bolted as 

 shown in the figure. The frame carries three booms (B) swing- 

 ing outward from the frame and each is kept pressed away from 

 the frame by means of a spring (A). Xear the free end of each 

 boom is placed a cyclone type of nozzle (X) set so as to deliver 

 the spray upward. This nozzle is prevented from tearing the 

 young canes of the grape and at same time is protected by means 

 of the slanting projection (P). The spray material is delivered 

 to the pipe (G) from which it is distributed by hose (H) and pipe 

 connections (C). The upper and middle booms are of different 

 lengths and swing from the forward part of the frame, the shorter 

 being above. The lower boom is of the same length as the middle 

 one but is swung from the upright at the offset in the frame. 



This attachment as used in the experiments mentioned before 

 was built under the author's directions bv Mr. George Laurie of 

 Silver Creek, who constructed it with the following dimensions 

 and materials : The frame is of %-iiich iron pipe, being of the di- 

 mensions shown in the drawing (Plate XXXIII). Screw threads 

 are cut on the pipes which are fitted into the various elbows and 

 T's used. The supports are ^-inch iron rods having screw 



