SPRAYING 



79 



remedy for San Jos6 scale also has considerable 

 fungicidal value. It is especially useful in early 

 spring sprayings on peach trees, at which season it 

 has measurable efficacy in preventing leaf curl. 



FIG. 40 — GRAVITY MIXING OF BORDEAUX MIXTURE 



FIGHTING INSECTS 



There are two very different types of insects 

 which require altogether different methods of treat- 

 ment for their suppression. One class takes its food 

 by eating the leaves of the trees, the other by 

 puncturing the bark and sucking the sap. The 

 former insects may be killed by poisoning the foli- 



