10 
SPECIAL BULLETIN NO. 8 
Fig. 8. Hopperdozer 
The hopperdozer has been used for some time to catch grasshoppers in their 
wingless stages. This consists of a long shallow pan m.oimted on runners so that 
it can be drawn sidewise over the ground. The pan is partly filled with water and 
a small quantity of kerosene is poured on the surface of the water. Partitions may 
be placed in the pan to keep the water from slopping out. At the back of the pan 
is fixed a shield of canvas three feet high and this is wet with kerosene. The hopper- 
dozer is pulled across the field by horses. The grasshoppers jump when it reaches 
them and are killed by coming in contact with the kerosene in the pan or on the 
shield. The hopperdozer is effective onl}^ after the grasshoppers are big enough to 
jump into the pan and before they can fly. 
, Poison Sprays. — Grasshoppers may be destroyed by a sweetened poison 
sprayed on the grass which serves as their first food. The spray should be applied 
as soon as the hoppers are hatched. Delay may prove fatal as they often move 
very quickly into the crops, where it is not so easy to carry out repressive measures. 
Promptness of action means saving of time, labor, and money, because the work 
Fig. 9. ^ Field Sprayer 
