322 CONTROLLING INSECTS AND DISEASES 



connecting pipe may clog. Since both materials carrying sedi- 

 ment in suspension and those which do not enter into the 

 normal spraying program, the suction type of feed is preferable. 



6. The Truck, A truck with a heavy steel frame rigidly 

 bolted or riveted is best. Rocking bolsters compensate for 

 unevenness in the ground, keep the load in proper position, 



under the frame are desirable 

 for close quarters and sharp 

 turns, as in closely planted 

 orchards. Wide tires are best 

 on sandy or soft ground. The 

 heavier machines are equip- 

 ped with tires 5 to 8 inches 

 wide. On the other hand, on 

 steep, hard ground, narrow 

 tires will cut in more and 

 give better footing than wide 

 tires. 



Pneumatic tires are being 

 used on many trucks. There 

 seems no doubt that the life 

 of equipment mounted on 

 rubber is longer. The ease of 

 handling and all-round gen- 

 eral efficiency make it seem 

 likely that before very long rubber mounting will be standard 

 equipment. 



7. The Tower. A tower mounted on the tank is desirable 

 for spraying tall trees. With the advent of the spray gun 

 and the practice of heading trees lower than formerly, the 

 tower is not so necessary as in the past. HoweA^er, in many 

 places the efficiency of the spraying job would be increased by 

 its use. Where trees are 20 feet or more in height, the tower 

 should be considered standard equipment. 



8. Nozzles, Nozzles are of two general types. The Bor- 

 deaux nozzles exemplifies the first, giving a flat, fan-shaped 



{Bardie Mfg. Co.) 



Fig. 115. The suction strainer in 

 the tank should be of heavy brass 

 mesh, and readily accessible for 

 cleaning. 



