Agriculture . es of trees or other plantsinfested with lice we may find some of the beautiful littlelady-beetles and their larvaj feeding upon the lice. Anotherenemy of lice is the aphis-lion, the larva of a lace-wing fly. Flies—If you examine a common house-fly or a mosquito,you observe that it has only two wings. Here then we haveanother order, that of the two-winged flies, known as Hessian fly, the wheat midge, the many flies of root plants,mosquitoes, fleas, and many of the flies that annoy stock—allhave two wings only and belong to this order. The Hessian fly appears in spring
Agriculture . es of trees or other plantsinfested with lice we may find some of the beautiful littlelady-beetles and their larvaj feeding upon the lice. Anotherenemy of lice is the aphis-lion, the larva of a lace-wing fly. Flies—If you examine a common house-fly or a mosquito,you observe that it has only two wings. Here then we haveanother order, that of the two-winged flies, known as Hessian fly, the wheat midge, the many flies of root plants,mosquitoes, fleas, and many of the flies that annoy stock—allhave two wings only and belong to this order. The Hessian fly appears in spring asa small winged insect with long female lays about twenty eggs inthe fold or crease of the leaf of theyoung wheat plant. After a few days thelarvae hatch and get down between thestem and leaf-sheath. Here they feedon the plant and weaken it so thatthe heavy hjad soon after topples overand the grain is destroyed. The eggsmay be laid either in the spring or inthe early fall. When the latter ig the. Fig. 40 —The Hessian fty, atwo-winged insect. INSECTS OF THE FIELD. 8S case the young insects gent-rally pass through the winter inthe pupa state, known as the the flax-seed condition,because the pupa case is like a flax-seed. Any such found inwheat screenings should of course be burned, and where foundin the field the stubble should be cut and burned. Theprincipal remedy for the Hessian fly then is to completelyburn all material containing the young insects and to changefrom wheat to a cultivated crop, as roots or corn. The Hessianfly attacks wheat, barley, and rye. The Clover-Seed Midge lays its eggs in the young clover-heads where the larvce or orange-colored maggots hatch outand do much damage. Then they fall to the ground and com-plete their changes, appearing as full-grown insects towards the latter part of summer, ready todo damage again to the secondcrop of clover. Where themidge is doing much damageit is evident that the pasturingoff of the first crop of clove
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Keywords: ., bookcentury1800, bookdecade1890, bookidag, booksubjectagriculture
