METHODS OF APPLYING SPRAY MATERIALS 



93 



of the cyclone type with a very small orifice is best adapted to 

 general spraying of vegetable crops. As high pressure as is con- 

 sistent with the type of spraying apparatus used is advisable. 

 For small-area vegetable spraying, a compressed air sprayer of 

 the knapsack type (Fig. 50) is very satisfactory, since it can be 

 carried anywhere and used in thickly planted areas as well as 

 where the rows are wide apart. However, for plantations of any 

 considerable size, spraying with such an apparatus becomes very 

 tedious, and a larger outfit should be employed. A regular barrel 

 spray pump mounted on a two-wheeled cart is quite generally 

 useful in spraying an assortment of vegetable crops (Fig. 51). 



Fig. 51. — Spraying eggplants with small-sized barrel pump. 



In order that such an outfit may be used to best advantage, it is 

 advisable in planting the crops to space the rows for the accom- 

 modation of the spray cart, or if a close-planted crop is to be 

 sprayed, to leave driveways at sufficiently close intervals so that 

 the hose will reach half-way from one drive to the next. When 

 large areas are planted to individual crops requiring spraying, 

 spray machinery designed especially for the purpose is usually 

 employed. Thus there are potato sprayers that spray three or 

 four rows at a time, as fast as a team can walk. Melons may 

 be sprayed with similar outfits by proper training of the vines 

 (Fig. 52). 



