CLOVER LEAFHOPPER AND ITS CONTROL. Ve 
Tree tanglefoot can be obtained in 10-pound cans at $1.65 per can, 
and the castor oil at a maximum cost of 30 cents per quart. With- 
Ime. 4.—Front view of hopperdozer for destruction of leafhoppers as it is being drawn 
through an alfalfa field. (Original. ) 
out considering labor, the cost of this control measure should not 
be more than $4 for 100 acres, or at the rate of 4 cents per acre. 
Fic. 5.—Side and back view of the hopperdozer for destruction of leafhoppers. The 
horses are hitched to the projecting ends of the two-ty-four. (Original.) 
This method is practical in fields covering several hundred acres as 
well as in small fields. Other sticky substances such as cheap sor- 
