This section is from the book "The Potato: A Compilation of Information from Every Available Source", by Eugene H. Grubb, W. S. Guilford. Also available from Amazon: The Potato: A Compilation Of Information From Every Available Source.
Grasshoppers are not often counted as an insect enemy of the potato, but their ravages in eastern Colorado have been such that growers have lost heavily. S. Arthur Johnson in "Bulletin 175" of the Colorado Agricultural Experiment Station describes the insect as follows:
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 midsummer or later.
Grasshoppers frequently injure potato fields by invading them from the borders, but this is not one of their favorite food plants. The most serious relation of grasshoppers to the potatoes is indirect rather than immediate. Potato growers depend on alfalfa 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.
The best remedy to employ during fall and spring is the destruction of the eggs. The first step in this work is to locate the eggs. Inspection should be made everywhere in the surface of the soil for the pods of eggs. When the infested areas have been located they should be plowed deeply to bury the eggs, or disked or harrowed very thoroughly to break up the pods so that they will be exposed to the ravages of birds and animals or dried out before they have time to develop.
The earlier in the fall that this remedy can be applied the more satisfactory will be the results. It is better not to trust to one treatment, but to work over these places several times at short intervals. When young, or even when full-grown, grasshoppers may be caught successfully in a hopper pan. If this is set on wheels a few inches above the surface of the ground and driven over the alfalfa when that is a few inches high, great numbers may be caught. The best time to do this is in the early morning when the hoppers are on the tops of the stems and somewhat numbed with the cold. A third remedy is arsenic-bran mash. This substance is made by mixing white arsenic with bran at the rate of one pound of arsenic to twenty of bran. After the substances are thoroughly mixed add sufficient water to make a sticky but not too sloppy material. Some add a little anise or syrup. The mixture should be scattered late in the afternoon or early in the morning so that the hoppers will get it before the hot sun has dried it up.
In the Greeley experiments of 1910 the potatoes were sprayed with Bordeaux mixture to test the value of this substance as a repellent to grasshoppers. The results appeared to be favorable as to keeping off grasshoppers, but indecisive as to the prevention of flea beetle injuries to potato tubers.'