318 PRINCIPLES OF SPRAYING 



A spray calendar is a convenient reminder and guide in fight- 

 ing insects and preventing diseases. The accompanying table 

 was prepared by the Minnesota Station, (Bulletin 153). In almost 

 every case an insecticide should be combined with a fungicide to 

 save labor and accomplish two purposes at once. The calendar 

 suits all parts of the country, but will always need to be varied in 

 some particulars to suit the season or conditions. 



SPRAYING EQUIPMENT 



One of the simplest garden sprayers is the hand sprayer which 

 holds from one pint to one quart of liquid, shown in figure 220. 

 The liquid is forced out and upon the plants by the force of air 

 blown by the pump. It is really an atomizer. This is perhaps the 

 simplest and cheapest sprayer in use in small gardens. 



Knapsack Pump. — A flattened oval vessel holding from three to 

 five gallons may be easily strapped upon the back of the operator. 



Fig. 220. — A small hand sprayer will be of much help in a small garden. 



A pump in the center is operated by a lever extending in front to 

 either the left or the right side. In the other hand the operator 

 holds the hose or short extension rod in spraying. The movement 

 of the body will keep the liquid fairly well agitated. The operation 

 of this sprayer is not tiresome, but unless care is exercised the 

 slopping of the liquid may be disagreeable upon one's back. 



Compressed air sprayers of the three gallon or five gallon size 

 may be carried as shown in figure 221. The pressure pump in 

 the top is operated before spraying begins. Agitation of the 

 liquid is easy while carrying the vessel. This sprayer is well suited 

 to work in small gardens. 



A bucket pump is a very simple sprayer. Some forms are made to 

 clamp on the side of a deep bucket holding 3 or 4 gallons. The 

 pumping is done with a lever by one operator who may hold the 

 extension rod in the other hand and spray any plants either high 

 or low. 



Barrel sprayers are of several kinds (Figs. 222 and 223). Those 

 using a barrel without a head are most easily cleaned, and usually to 



