INJURIOUS INSECTS OF 190.3. 



155 



(c) It is not especially effective against the Codling Moth for 



obvious reasons. 



(d) One must carefully avoid the dust, and see that it is not allowed 



to settled on the horses. 



(e) Nothing can be used in dust form so good for sucking insects, 



such as plant lice, as kerosene emulsion. 



(f) Arsenate of lead, which is coming into universal favor as a safe 



remedy against biting insects, cannot, of course, be used as 

 a dust spray. 



It would seem that it will never replace liquid spraying", yet 

 since it is in many ways as good and in a few points superior to 

 the former, it cannot be entirely disregarded. 



Fig. 96. — The Leggett London Purple Gun. 



Successful application calls for special machinery. The dust 

 sprayer shown in Fig. 96 is Leggett's London Purple Gun, which 

 has long been on the market' and in use for applying London 

 Purple or Paris Green in a dry form, when mixed with lime or a 

 cheap grade of flour, and for the application of hellebore. While 



Fig. 97. — The Cyclone Sprayer. 



this machine is excellent for what it was planned for, viz., spray- 

 ing small trees, bushes and plants, manifestly, when large trees 

 or whole orchards or large fields of plants are to be treated, a 



