. Principles of economic zoo?logy. Zoology, Economic. VoLuCeLLA fNANS. VsspA Vol .- Bomb Vlai^S, BOMaUS LABItlARlJs. Fig. 13L\ -Two cases of mimicry: flies resembling a wasji in the one, and a bee in the other. (Romanes.) destructive to cultivated plants. The minute reddish or white eggs are deposited on or in living plants, and the maggot-like lar\';e probably imbibe their food through the skin. The Hessian fly belonfi;s to this family. It is a t iny blackish midge which lays its eggs (Fig. 131) in the .sheaths of leavi-s some distance from the ground. The larva lives between the b
. Principles of economic zoo?logy. Zoology, Economic. VoLuCeLLA fNANS. VsspA Vol .- Bomb Vlai^S, BOMaUS LABItlARlJs. Fig. 13L\ -Two cases of mimicry: flies resembling a wasji in the one, and a bee in the other. (Romanes.) destructive to cultivated plants. The minute reddish or white eggs are deposited on or in living plants, and the maggot-like lar\';e probably imbibe their food through the skin. The Hessian fly belonfi;s to this family. It is a t iny blackish midge which lays its eggs (Fig. 131) in the .sheaths of leavi-s some distance from the ground. The larva lives between the base of the leaf and the main stalk and feeds upon the sap of the grow ing wheal. There are four or five broods a year, both spring and winter wheat being infested. It is estimated that the ravages of this insect cosr the fanners of this country $10,000,000 annually. Were it not for its natural enemies, a half-dozen hymenop- terous parasites, it would soon take the whole crop of \\-heal, rye, and barley. The chief remedies which the farmer can use are the late planting. 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 Daugherty, Lewis Sylvester, 1857-; Daugherty, L. S. , Mrs. , 1859-. Philadelphia, London, W. B. Saunders
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherphila, bookyear1915
