SPRAYING 213 



check all the pests which attack all the 

 parts of the plant above ground. The va- 

 rious spray solutions which may or may not 

 be combined are indicated by Cooley and 

 Swingle * in the following table : 



* The advisability of making these two combinations 

 needs further investigation. 



Each of these preparations is mixed and 

 applied just as if it were used alone. A 

 combination of the ammoniacal copper 

 carbonate with an arsenate would be un- 

 safe, since the ammonia renders the arsenic 



* Cooley, R. A., and Swingle, D. B., A spraying pro- 

 gram for Montana orchards. Montana Agr. Expt. Sta- 

 tion, Circ. 17: 119-151, 1912. 



