12 
The Colorado Experiment Station 
A hopper dozer in action. One of the many machines that was used 
in the grasshopper campaign, 1916, San Luis Valley. Note the hoppers 
in the pan. (Original). 
the hoppers jump to avoid it and are caught in the sack. When a 
sufficient quantity of hoppers are thus trapped, the rider, with 
the assistance of a helper, opens the apex and shakes the captured 
grasshoppers into a sack. 
This apparatus originated in British Guiana, and is used ex¬ 
tensively in India and other countries where grasshoppers appear 
in immense swarms.* It was also used effectively in Utah in the 
outbreak of grasshoppers in 1915, when it v^as reported that at 
least four hundred tons of grasshoppers were captured by the use 
of these balloons.** 
The Live Hopper Machine .—This apparatus (Plate II) was 
constructed and successfully used in Colorado in 1902, and has 
later given satisfaction as a hopper machine in Utah and New 
Mexico, and in the San Luis Valley the past season. It has the 
advantage over other hopper dozers in that it can be operated on 
rough areas. Its construction is very simple. It consists of a rect¬ 
angular box two feet square and sixteen feet long, fastened on 
runners. The top and back of the box should be covered with 
screen wire and provided with a door for getting the hoppers out. 
The front should be concave, three feet high, and covered with 
*Philippine Agricultural Review III, 4, 1910, pp. 237-238. 
**“How to Control Grasshoppers,” Utah Agr. Exp. Sta. Bui. No. 138, 1915, 
pp. 98.-99. 
