74 INSECT PESTS OF FARM, GARDEN AND ORCHARD 



results with barrel or horizontal pumps which will maintain a 

 pressure of 85 pounds or more. One of these nozzles to each line 



of hose will be sufficient with a barrel 

 pump, and two to a line with power. 

 The disk type is adapted to orchard 

 and shade-tree work. 



The Bordeaux nozzle is of entirely 

 different structure, the spray being 

 formed by a straight stream hitting a 

 lip which breaks it into a fan-shaped 

 spray, the fineness of the spray being 

 governed by the width of the aperture. 

 To unclog the nozzle the core through 

 which the stream emerges is reversed, 

 thus giving a straight stream and clear- 

 ing the nozzle immediately. For this 

 reason the Bordeaux nozzle is partic- 

 ularly adapted to traction sprayers 

 where several nozzles are used and it is 

 necessary to unclog them quickly. It 

 is usually preferred for garden and row 

 crops, and some prefer it for tree work, 

 though it is not as widely used for that 

 purpose as the previous types. 



At the present time these three 

 types of nozzles are much superior to 

 all others, and the user will do well to 

 stick to them and let others experiment 

 with new or cheap creations until 

 they have proven themselves better. 

 Nozzles which merely sprinkle or make a 

 strong long stream are undesirable for 

 spraying. 



FIG. 46. Bamboo extension 

 rod at left, and iron rod 

 with drip-guard at right. 



Extension Rods. In orchard spraying an extension rod is a 

 necessity. Most pump companies sell a bamboo rod enclosing a 

 light brass tube, and fitted with thread for the nozzle at the tip and 



