INSECTS INJURIOUS IN 1902. 29 
Natural enemies, however, are not sufficient and farmers 
should know the best methods of combating a pest which is at 
times so serious. 
PROTECTIVE AND REMEDIAL MEASURES. 
Fall plowing of stubble or early plowing of the same in the 
spring before May 10th is the safest, best, and simplest method 
known to prevent the young hoppers from issuing from the egg 
cases. Co-operation in this, as well as in the treatment of all insect 
pests is absolutely essential. If one farmer plows and his neigh- 
bor does not, the work of the first is thrown away. 
Young hoppers while very small, before they are large enough 
to avoid the plow, may be plowed under. It is advisable in this 
case to begin at the edge of the field and plow towards the center. 
When infested pastures cannot be sacrificed to the plow the 
hopper-dozer can be well used. Vegetable gardens lying within 

Fig. 26.—Egg-mass of Rocky Mt. Locust—(a) from the side, within burrow; 
(b) from beneath; (c) from above; (d) indicates the natural exit 
for young locust if the soil is compact, and the dotted 
lines (e) the direction of exit in loose soil; 
enlarged (after Riley). 
an affected area, may, if the locusts are not very numerous, be 
saved by spraying something distasteful to the insects, like a well 
shaken mixture of kerosene and water or kerosene emulsion, upon 
plants not injured by such an application, or by poisoning with 
Paris Green vegetables whose parts reached by the poison are not 
used as food. 
Wheat land in which Grasshoppers are numerous should be care- 
fully examined in the fall for Grasshopper eggs, which are found 
near the surface of the soil not more than an inch from the top. 
Any doubt which the farmer has may be removed by sending the 
