. Practical agriculture [microform]. Agriculture; Agriculture. 84 In the case of house plants, garden plants and orchard trees we can wash and s[)ray with solutions that destroy the lice, hut with lice that injure the grain such means are not yet practi- cable. Why then do not the lice multiply so as to eat up everything in the fields? Simply because there are other insects that keep them in check. There are some tiny flies that attack the lice and lay their eggs right in the bodies of the lice. These parasites soon kill the lice. Other insects are destroyed in the same way, such
. Practical agriculture [microform]. Agriculture; Agriculture. 84 In the case of house plants, garden plants and orchard trees we can wash and s[)ray with solutions that destroy the lice, hut with lice that injure the grain such means are not yet practi- cable. Why then do not the lice multiply so as to eat up everything in the fields? Simply because there are other insects that keep them in check. There are some tiny flies that attack the lice and lay their eggs right in the bodies of the lice. These parasites soon kill the lice. Other insects are destroyed in the same way, such as cater- ^'g- 39—Caterpillar covered with parasites. pillars and grasshoppers. If we carefully examine the leaves of trees or other plants infested with lice we may find some of the beautiful little lady-beetles and their larvae feeding upon the lice. Another enemy 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 have another order, that of the "two-winged" flies, known as diptera. The Hessian fly, the wheat midge, the many flies of root plants, mosquitoes, fleas, and many of the flies that annoy stock—all have two wings only and belong to this order. The Hessian fly appears in spring as a small winged insect with long legs. The female lays about twenty eggs in the fold or crease of the leaf of the young wheat plant. After a fe \v days the larvae hatch and get down between the stem and leaf-sheath. Here they feed on the plant and weaken it so that the heavy head soon after topples over and the grain is destroyed. The eggs may be laid either in the spring or in the early fall. When the latter is the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original James, C. C. (Charles Canniff)
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Keywords: ., bookauth, bookcentury1800, bookdecade1890, booksubjectagriculture
