jN^ew Yoek Agricultukal Experiment Station. 379 



threads at one end to fit into the T's, and the other end flattened 

 to a width of 1^4 inches with ^-inch holes drilled about 6 inches 

 apart. The booms are made of iVinch tire steel 2 inches wide and 

 have the shapes showai in the illustrations (Plates XXXIV- 

 XXXVII). One end of each boom is bent entirely around 

 the pipe, thus forming a bearing. Brass spring wire % inch in 

 diameter is inserted in a small hole in the pipe and the wire 

 wound about the pipe several times, thus forming a coil spring 

 with the end attached to the boom about one foot from the spring. 

 The springs are above the middle and lower booms, but the spring- 

 is below the upper one, thus serving to hold the boom in position. 

 The slanting projection is a piece of tire steel % inch wide, % 

 inch thick and 6 inches in length. This is riveted to the inner 

 side of the boom about 8 inches from the end and set at an angle 

 of 20°. The nozzle is of the cyclone type with a large apertured 

 disc. The nozzle is connected to a short pipe by means of two 

 street L's which allow the placing of the nozzle in any position. 

 The pipe is about one foot in length, is fastened to the booan end 

 and connects with the hose by means of an elbow ard a nipple. 

 The hose is l/o inch in diameter and connects by a nipple fastened 

 to tho sT!r>r)lv pipe. The lower boom should be about 8 inches from 

 the ground, which would place the middle boom about 1 foot 8 

 inches and the upper one 3 feet 4 inches above ground. This ap- 

 paratus is designed for grapes on wires with the rows 8 to 10 

 feet apart. It can be built by a blacksmith or plumber for less 

 than $20 (not including the cost of the nozzles). 



RECOMMEXDATIOK^S. 



To obtain efficient results against the leaf-hopper with either 

 the trailing hose and extensions or the automatic grape leaf- 

 hopper sprayer, the following precautions should be observed : 



(1) The spraying must he done at the proper time. — This time 

 will vary with the season, but in Chautauqua county it is some- 

 time during the month of July. The first nymphs appeared 

 June 12, 1911, whereas the first nymphs for normal years ap- 



