CHAP. XI. J THE CONTROL OF [NSE< l PESTS OF CROPS. 



J 15 



In fillii « ravers n must be remembered thai space 



must be left for the air to be compressed and al least one-quarter 

 of the capacity of the tank must therefore be left unfilled. 



Amongst the advantages of the useof Pressure S are the 



facts that the) are easily portable, do not leak (as is often the case 

 with a Knapsack Sprayer) and only one hand is required to direct 

 the hose, leaving the other free, so that a tree may be climb 



1 II mi ami 1 -gallon types. 



(Author's original 1 



spraying may be done from a step-ladder, under conditions in 

 which the use of a knapsack hand-sprayer would be impracticable. 

 For this last reason " Holder " Sprayers of the one-gallon 1 

 in fairly extensive use in Southern India for the spraying of palm- 

 trees for control of fungus diseases, as the operator can climb the 

 tree with the fully charged sprayer slung over his shoulder, either 

 n a small canvas bag, mm\ can then carry on 

 spraying with tin- aid of one hand only. Largei patterns of the 

 "Holder" type are also available for use with ordinal 

 and trees whilst a wheeled ten-gallon pattern is suitable for fruit- 

 gardens and similar aieas. Pressun Sp the " Autos 

 pattern, obtainable in Calcutta al from Rs. 30 to 35, contain three 

 gallons of liquid, weigh 40 pounds when fully charged and have 

 been used verj successfully in India. Such sprayers are suitable 

 tying small areas of crops and for use around houses. We 

 have also found them peculiarly suitable for the spraying of cattle 

 for insect parasiti lelivered on simply turning a 

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