CHAP. XI. nil CONTROL OF [NSE< i PESTS OF CROPS. 



109 



about fifteen to twenty rupees each and are suitable lor small 

 areas, such as gardens, small fruit-gardens or small anas ol 

 crops. If a longer hose is fitted and the nozzle fastened to a bamboo 

 it is possible to spra 3 small trees with one ol these pumps, but the 

 waste of time and labour incurred in moving the bucket from one 

 tree to another and the difficulty of working the pump and directing 

 the spray at the same time renders this type unsuitable for work on 

 anj large scale. For use around a house, r, the Bucket 



Sprayer is very suitable and it may ol .muse be used for such 

 purposes as the application of whitewash 01 disinfectants. As 

 these sprayers have no agitator care must be taken that the spray- 

 material is kept properly mixed and this end may be achieved bj 

 pumping it back on itself occasionally ; this applies to spraying 

 syringes also. 



Fig. +5. — Bucket Pump in use. (Author's original phol 



Knapsack Sprayers are so called because thej are usually fitted 



with straps and are intended to be hung over the shoulders like 

 a knapsack. In this type the spray-material is contained in the 

 sprayer itself which is provided with a pump, delivery-tub 

 noz/le. and also with an agitator in all efficient patterns. The tank 

 contains a variable amount of liquid, usually from one to four 

 gallons. The patterns usually imported from Europe or America 



. — It should lachines and formulae, 



thai the American gall five-sixlhs of th Ion. 



