10 
The Colorado Experiment Station 
harrowing or discing will give excellent results in egg destruc¬ 
tion. This should be to a depth of at least two inches, the ground 
thoroly stirred, and the egg clusters broken and exposed. This 
allows birds and other enemies, as well as temperature, to destroy 
them. 
Young orchards may be protected by thoroly spraying the 
trees with arsenate of lead at the rate of 3 pounds of powder or 
6 pounds of paste, to 50 gallons of water. 
APPARATUS FOR CAPTURING GRASSHOPPERS 
There are three principal mechanical devices used in catching 
young grasshoppers. These are all under the same general plan, 
but may be classed as the “Hopper Dozer”, the “Balloon Hopper 
Catcher”, and the “Live-Hopper Machine”. The first two are de¬ 
signed to be used on level cultivated fields or meadows, and are 
the most economical methods for mechanically destroying grass¬ 
hoppers, but their use will not insure as complete and effective 
control as the poison bait method. However, some users of the 
above machines are very much in favor of them. This is probably 
due to the fact that with these they can see the immediate fruits 
of their labor. 
Hopper Dozer .—A very cheap and practical hopper dozer 
(Plate 1, Pigs. 3-4) consists of a sheet-iron pan three or four 
inches deep, placed upon wooden runners with an upright oil¬ 
cloth or piece of canvas two and one-half feet high at the back. 
This is to prevent the insects from flying or jumping over the 
pan. When ready for use, put an inch of water in the pan 
with a little coal oil and drag it across the field, and the hoppers 
'will jump or fly into it. The horses should be hitched, well 
spread, at either end of the dozer, so as not to frighten the hop¬ 
pers from in front of it, and then, as the machine approaches, 
many of the hoppers will jump and alight in the oil and water. 
The winged hoppers will, in most cases, fly against the back of 
the hopper dozer and fall into the pan and be killed by the oil. 
Those that crawl out will soon die from the effects of the oil. 
Where the hoppers are very numerous, they will soon fill the pan 
and have to be removed. At intervals, a fresh supply of oil and 
water will be needed. To prevent slopping from end to end, it 
is well to put partitions across the pan every two or three feet 
with a small opening beneath them. 
Anyone can build one of these pans or dozers to suit himself. 
Mr. P. K. Blinn*, of Rocky Ford, Colorado, has constructed a 
*“A Hopper Dozer,” Bulletin No. 112, Colorado Agricultural Experiment 
Station. 
