164 



PRINCIPLES OF PLANT CULTURE 



304. Apparatus for applying insecticides. — Powders 

 are readily applied to low-growing plants, such as the 

 potato, cabbage and the like, by means of a sifting-box 

 consisting of a pail with a perforated bottom, a rigid 

 handle and a tight-fitting cover (Fig. 68). For small 

 plants, such as young potato tops, the tin disk A, which 

 has a circular hole in the center, is laid inside on the 



Fig. 69. Fig. 70. 



Fig. 69. — Bucket sprayer for small trees and bushes. 

 Fig. 70. — An atomizer or hand cylinder pump. 



bottom of the box, and lield in place by small lugs soldered 

 to the wall as shown. When it is desired to spread the 

 powder more, the disk B is used. 



For taller plants, a powder bellows or power dusting 

 machinery is desirable. 



Liquid sprays are best applied with a hand atomizer, 

 knapsack or bucket pump (Fig. 69), or a spray pump. 

 An atomizer, to be carried by the operator as in Fig. 70, 



