6 FARMERS’ BULLETIN 1737. 
USE OF THE HOPPERDOZER. 
For direct control the hopperdozer is recommended. Any hopper- 
dozer which has been constructed to capture grasshoppers will suffice, 
but a much lighter and less expensive one can be made by stretching 
canvas over a light wooden frame. The diagram, figure 3, shows 
how it can be made. It is of such ight weight that in pulling it over 
alfalfa and clover the plants are not injured. In pulling this hop- 
perdozer through fields which are free from stones runners will not 
be necessary. It is drawn by two horses, one hitched at either end 
of the two-by-four, and is dragged over the crop, covering as much 
acreage in the same length of time as is gone over by a cutting or 
mowing machine. Figures 4 and 5 show the front and back of the 
hopperdozer ready to be drawn through an alfalfa field. It is to 
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Ss — 
Fic. 3.—Construction of frame of hopperdozer for destruction of leafhoppers, over which 
canvas is stretched. (Original.) 
be regretted that in figure 4 the bottom of the hopperdozer is not 
- visible. Heavy canvas is stretched and tacked or nailed over the 
inside of the frame, covering bottom, back, and sides. 
Over the canvas, on the inside, is applied a thin coat of a sticky 
substance made of tree tanglefoot which has been thinned with a 
cheap commercial grade of castor oil at the rate of 1 pound of 
tanglefoot to one-fourth pint of castor oil. This can be spread on the 
canvas with a paddle or shingle. The leafhoppers and other insects 
alighting on the sticky surface are held fast. These insects, together 
with dried leaves which will adhere to the canvas, can be scraped 
off whenever necessary and another coating of tanglefoot applied. 
One coating should be sufficient for 5 acres. 
The cost of the hopperdozer should be little more than the price 
of the canvas, as odd pieces of lumber can be used in construction. 
