8 
THE COLORADO EXPERIMENT STATION 
acre and usually much less. The oilcloth screen at the back of 
j 
the dozer is an important feature as it does not allow the hopper 
to stick to it and those that hit it fall into the pan and are 
killed. 
The wheels attached to the runners lighten the draft and en¬ 
able one horse to pull the pan to one side as explained and shown 
in Plate I., and also allows the pan to be drawn through standing 
alfalfa without trickling it down to any extent. For larger fields a 
longer pan, say from 12 to 16 feet, would doubtless be more eco¬ 
nomical, but a long pan would need divisions to prevent the water 
from flowing to one end 011 steep ground. 
A good example of the destruction of grasshopper eggs by 
early spring or winter discing of the alfalfa fields, was seen on the 
farm of Mr. C. J. Cover. His field was purple with bloom with 
comparatively few grasshoppers while all neighboring fields had 
been stripped of bloom by grasshoppers. 
