14 FARMERS’ BULLETIN 1747, 
CONTROL MEASURES. 
There are three principal methods of control which have been 
found to be of greater or less practical value in combating grass- 
hoppers in this country: First, the destruction of the eggs; second, 
catching the insects in the field by means of traps; and, third, the 
use of the poisoned baits. 
DESTROYING THE EGGS OF GRASSHOPPERS. 
It is seldom practicable to destroy the eggs because of the many 
different hiding places chosen by the grasshoppers in laying them 
and the impossibility of reaching the same with cultivating imple- 
ments. However, where they are accessible the ground containing 
them should be thoroughly plowed, or disked, and harrowed in the 
fall, as these operations prevent the eggs from hatching successfully 
the following spring. Attempts to reach the eggs by handwork, 
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Fie. 18.—Hopperdozer with cloth back, showing construction. (Original.) 
such as digging up the soil, is practicable only in gardens, truck 
farms, and places where intensive cultivation is practiced. 
MECHANICAL MEANS OF DESTROYING GRASSHOPPERS. 
The most common method of destroying grasshoppers mechanically 
is by the use of a simple horse-propelled implement or trap com- 
monly called a hopperdozer. These implements are constructed 
along similar lines, but are of many slightly different patterns. As 
originally built the hopperdozer consisted of a galvanized sheet-iron 
pan or trough having a back rising at right angles to the pan. It 
was about 16 feet in length and mounted on runners made of wood 
or old wagon tires. Most of the hopperdozers recently constructed 
have a pan made of galvanized sheet iron, but the back and side wings 
are usually built with a wooden frame covered with stout muslin or 
light cotton duck, thus securing lightness and elasticity of structure. 
(Fig. 18.) The pan of the hopperdozer is kept partially filled with 
