44 The Colorado Experiment Station. 
* 
shrivel, and the tomatoes may die. Ordinarily the stand of the 
potato crop is not seriously injured in this way. Their greatest 
damage to potatoes in Colorado is done by the larvae which live 
underground. These larvae are tiny white grubs which attain a 
length of about a quarter of an inch. The first brood is to be found 
during June or early July. They frequently cut into and destroy 
the young tuber stems of the potatoes, thus preventing a regular 
setting of the crop. The second brood of larvae appear during 
August and September. This brood bores into the flesh and under 
the skin of the potatoes, causing a pimply or scabby development, 
which may cause great waste in preparing the tubers for the table 
and seriously depreciate their market value. 
Remedies .—No satisfactory remedy for this pest is known. 
The leaf injuries to young potatoes and tomatoes may be largely 
avoided by spraying the leaves thoroughly with Bordeaux mixture 
to which Paris green is often added. The insects appear to avoid 
the parts of the plants covered with these disagreeable substances 
and to seek fresh tissues upon which to feed. It is not certain where 
the insects hibernate, but they are often found in the fall in large 
numbers feeding on stray potato plants or pieces of tubers which 
have been left in the fields. It is well to clear up the fields imme¬ 
diately after the crop is gathered. These insects are seldom, if ever, 
found on new ground and are much worse where potatoes are 
planted in succession. 
grasshoppers. 
The Insects .—There are many kinds of grasshoppers, but the 
species that become injurious have life histories which are very 
much alike. The eggs are laid in the fall in packets in the ground, 
containing from thirty to a hundred eggs. Their position is about an 
inch below the surface of the soil. The insects appear to select 
places which are comparatively dry in which to deposit the eggs, 
and we have found most of them this year in patches of weeds and 
grass under fences, and along ditch banks and roadsides. The 
young hatch rather late in the spring and do not become full grown 
until mid-summer or later. 
Injuries .—Grasshoppers frequently injure potato fields by in¬ 
vading them from the borders, but this is not one of their favorite 
food plants. The most serious relation of grasshoppers to the pota¬ 
toes is indirect rather than immediate. Potato growers depend on al¬ 
falfa to renew and enrich the soil. The presence of grasshoppers 
in the fields newly sown to alfalfa is disastrous, for they quickly 
destroy the little plants and it is impossible to obtain a stand. This 
prevents a proper rotation of crops. 
Remedies .—The best remedy to employ during the fall and 
spring is the destruction of the eggs. The first step in this work 
