Where the pests attack or are about to attack a field of alfalfa, Prof. L. Bruner, of the Nebraska station recommends the use of a “hopper dozer,” which is “simply a long, shallow pan of stove-pipe iron or galvanized iron mounted on runners and backed by a light frame covered with cloth. The pan is about four inches deep, from eighteen inches to two feet wide, and from ten to sixteen feet long. It is partly filled with water and a little kerosene. A horse drags the machine across the field over the stubble of the first crop and the half-grown hoppers jump into the pan where the oil coats them over and kills every one that it touches. The hopper dozer works best on level land. On sloping ground the oil and water run to one end and slop over. To prevent this the pan is usually divided into sections by a number of partitions. The runners should stick out in front of the pan about a foot and one-half, and a piece of chain or heavy rope should be stretched loosely between them to drag ahead of the machine and make the hoppers jump. On level fields there are no great difficulties in the use of the hopper dozer. Careless driving may spill oil on some alfalfa and kill it. If these machines are to be really effective, they must be used before the grasshoppers get their wings. The first crop of alfalfa should be cut as early as possible, and the hopper dozers should follow the rakes as closely as may be. On the whole, they should be used only where plowing and harrowing have not been done or have failed to keep the grasshoppers in check.” Of the use of this implement or machine Prof. S. J. Hunter has this to say: “The height of the runners depends upon the height of crop to be protected. It is important that there be no timbers in front of the pan, so that its front line may come in contact with the grain passed over. The insects then fall directly into the fluid. When ready for use place two buckets of water and one-half gallon of coal-oil in a pan, and then drive back and forth across the end of the field where the grasshoppers are entering until you have filled the pans; remove the insects, replenish with oil and water, and continue until the field is rid of the pest.