. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. THE INSECT WORLD. 93 been treated at great length in the reports of the U. S. Entomo- logical Commission and of the U. S. Department of Agriculture, and these must be consulted : the methods discussed and recom- mended are too numerous for reference here. In the invaded regions fall plowing to destroy the eggs and the use of the "hopper-dozers" on the young are indicated. Under some circumstances, when the number of grasshoppers is n
. Economic entomology for the farmer and fruit-grower [microform] : and for use as a text-book in agricultural schools and colleges. Beneficial insects. THE INSECT WORLD. 93 been treated at great length in the reports of the U. S. Entomo- logical Commission and of the U. S. Department of Agriculture, and these must be consulted : the methods discussed and recom- mended are too numerous for reference here. In the invaded regions fall plowing to destroy the eggs and the use of the "hopper-dozers" on the young are indicated. Under some circumstances, when the number of grasshoppers is not too great, they may be destroyed, or a large measure of protection may be secured, by tempting them with poisoned bran, of which they seem to be rather fond. It should be com- posed of bran and Paris green, at the rate of one part of Paris green to fifty by weight of bran, thoroughly moistened with sugar water. Cabbage patches can often be protected in this way against grasshoppers that come from uncultivated land, and there are other cases where such a measure is of value. Indi- vidual judgment must determine those cases. The Lociistidce are "long-horned grasshoppers," "meadow grasshoppers," and "katydids," distinguished at once by very long, slender antennae, rarely shorter than, and usually much exceeding, the body. They are green in color as a rule, with slender legs and thin wings, and we find them a vast array of mu- sicians,—always the males only,—the sound-producing structure occupying a triangular area at the base of the fore-wings, where they overlap. Here one or more of the _ veins is elevated and ridged on each wing, and by rubbing these ridged surfaces to- gether a strident sound is produced, in- tensified by a membrane tightly stretched between them. The pitch and volume of the "song" are regulated by the develop- ment of veins and membrane as well as of the tegmina, no two species being alike in this respect. Special
Size: 1522px × 1642px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookpublisherphila, bookyear1896
