HANDBOOK OX IXSECT ENEMIES OF FLOWERS AND SHRUBS 107 



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Figure 161. — Applying sprays: A, 

 Spraying with a hand atomizer: B. 

 spraying with a compressed-air 

 sprayer. 



with the compressed-air sprayer. In 

 some types of this sprayer also agitation 

 is provided for by a brass plate insidh 

 the tank which moves up and down wite 

 the pump handle. A knapsack sprayer 

 consists usually of a force pump with an 

 air chamber fitted to a metal tank and 

 is designed to be carried on the back of 

 the operator. It can be operated by 

 one hand while the other is manipulat- 

 ing the spray rod and nozzle. The 

 sprayer has a capacity of about 3 to 5 

 gallons and a spraying range of about 

 25 feet when equipped with a nozzle. 



Bucket Pump 



until sufficient pressure is developed to 

 force liquid through the hose and nozzle. The bucket pump (fig. 163) is a useful 

 The hose is usually fitted with a spray piece of equipment for the home gar- 

 shut-off and a 1- to 5-foot extension rod dener. It is merely a single- or double- 

 with nozzle. The pressure decreases as acting pump with an adequate air cham- 

 the spray is forced out. and therefore it ber and equipped with hose and nozzle. 

 is necessary to renew it occasionally by The assembly may be clamped or set in 

 further pumping. Since these sprayers 

 are not provided with an agitator, it is 

 necessary to keep the material well 

 mixed by shaking the tank frequently, 

 although the movement of the operator 

 causes a certain amount of agitation. 



Knapsack Sprayer 



The usefulness of the knapsack type of 

 sprayer (fig. 162) corresponds closely to 

 that of the compressed-air sprayer, but 

 it can also be employed on larger plants, 

 including taller shrubs and trees. The 

 knapsack sprayer costs more than the 

 compressed-air sprayer. However, the 

 pump in the knapsack sprayer permits 

 the operator to maintain a higher and 

 more uniform pressure than is possible 



Figure 162. — Knapsack sprayer, 

 ful for large gardens. 



Use- 



Figure 163. — Bucket pump with hose, 

 extension rod, cut-off, and nozzle. 



a bucket or tub containing the liquid 

 insecticide. Its chief disadvantage is 

 that the operator must remain station- 

 ary while pumping. The most efficient 

 operation of the bucket pump requires 

 two persons — one to operate the pump 

 and the other to manipulate the hose 

 and nozzle. 



For more extensive spraying opera- 

 tions, as on large estates and in floral 

 nurseries, the use of larger equipment 

 such as the barrel pump, wheelbarrow 

 type, or small power outfit would be 



