181 



might cause clogging. A plunger surrounded by a spiral 

 spring, shown in the illustration, is provided for clearing 

 the nozzle if it becomes clogged. 



The Bordeaux nozzle (Pig. 169, No. 1) is adapted for 

 spraying Bordeaux mixture and other spray fluids which 

 are not true solutions or that contain solid particles 

 which would clog a nozzle like the Ver morel. The Bor- 

 deaux nozzle is adjustable, being capable of throwing a 

 solid stream when it is necessary in order to apply the 

 insecticide at some distance f rom the nozzle, and also of 

 throwing a fairly fine spray. 



In spraying for the control of scale and other sucking 

 insects with soft bodies, the object to be aimed at is to get 

 every part of the plant wet, but not sufficiently so to 

 cause any dripping from the leaves or branches. Spraying 

 with a stomach poison is for the purpose of applying the 

 poison in such a way that, in order to obtain its food, 

 the insect will have to eat the poison. 



The success of spraying depends on the care and 

 intelligence with which the operation is conducted. 



Power Sprayers. These are not likely to be adopted 

 for use in the West Indies, because of their very consider- 



Fig. 170. Fruitall sprayer. 

 Side of barrel cut away to show pump and agitator. 



