240 



MONTANA EXPERIMENT STATION. 



these areas. The observant farmer will locate these patches and 

 by ploughing deeply will place the eggs so far under the soil that 

 when the young hatch they will be unable to reach the surface. Even 

 the young hoppers, when very small, may be turned under in the 

 same manner. 



Where ploughing cannot be resorted to, a thorough harrowing, 

 especially with a disc harrow, will result in the destruction of a 

 large number of the eggs by crushing some and exposing others to 

 their numerous enemies and to frosts. 



Burning. — When the grasshoppers are young and travel slowly 

 they may be killed on or near the locality where they hatch by 

 covering them with a thin layer of straw and then burning it. 



In some sections of the west where crude petroleum can be ob- 

 tained at small cost it is sometimes employed in the form of a spray 

 as a remedy against young hoppers. This oil kills by contact but 

 additional effectiveness can be secured by. setting fire to the oil 

 on the gromid. 



Bandages. — Some property owners in Montana have suffered 

 injury to their fruit trees by grasshoppers. The young may be pre- 

 vented from climbing the trees by bandaging the trunks with cot- 

 ton batting, axel grease or some other adhecive substance. As the 

 grasshoppers acquire wings they may fly into the trees and in such 

 cases relief may be secured by the use of poisonous sprays. 



Hopper-dozers. — Hopper-dozers are metallic pans of any con- 

 venient dimensions which are partly filled with kerosene oil and 

 drawn about over the field for the purpose of catching the partly 

 grown grasshoppers. Many of the insects after hopping into the 



Fig; 10 Hopper-dozer, after Riley. 



